Waterbird Population Estimates for Herons

Below are the current (2012) estimates of the numbers of heron in various populations. Depending on the species, estimates may be for the entire species, a subspecies, or a geographic population. These estimates were derived by Wetlands International in partnership with HeronConservation and others. The entire report with information on the processes used may be obtained through Wetlands International.

Estimates are in all cases only that, and base on the best information available and best professional judgment of those who know the populations best. As information increases, estimates will be updated. HeronConservation will continue to partner with Wetlands International and the Ramsar Convention in periodically updating these estimates. All are invited to participate in making these estimates more accurate. Please communicate your data and suggestions to the HeronConservation Co-chairs or Steering Committee Members.

Heron Population Estimates

Scientific name

Common name

Population Name

Population Size.

Start Year

Population Size.

End Year

Minimum

Maximum

Population Size.Notes

Population Trend.

Start Year

Population Trend.

End Year

Trend

Population Trend.

Notes

Ardea cinerea Grey Heron cinerea, Sub-Saharan Africa

1990

2000

100000

1000000

1991

2001

STA
Ardea cinerea Grey Heron cinerea, Northern & Western Europe

2000

2000

263000

286000

1997

2007

INC Wetlands International 2012. Trend 1990-2007: +2.2% p.a. – Increase
Ardea cinerea Grey Heron cinerea, Central & Eastern Europe

2000

2000

189000

256000

1995

2005

INC
Ardea cinerea Grey Heron cinerea, West & South-west Asia (bre)

2002

2002

25000

1000000

1997

2007

INC Wetlands International 2012. Trend 1989-2007: +2.4% p.a.  – Increase
Ardea cinerea Grey Heron cinerea, South Asia

0

0

100000

100000

0

0

Unknown
Ardea cinerea Grey Heron jouyi, E, SE Asia

1987

1991

100000

1000000

0

0

Unknown
Ardea cinerea Grey Heron jouyi, Sumatra

0

0

1000

2000

0

0

Unknown
Ardea cinerea Grey Heron monicae

0

0

7500

12500

1984

1997

STA
Ardea cinerea Grey Heron firasa

2001

2001

5000

5000

1991

2001

DEC
Ardea herodias Great Blue Heron herodias, C & NE North America

0

0

124000

125000

This estimate includes two other populations (W N Americas and W N Americas, N Mexico).

1966

2000

INC
Ardea herodias Great Blue Heron herodias, W North America

0

0

-1

-1

The population estimate for C & NE N America includes the estimate for this population and also the W N Americas, N Mexico population.

1966

2000

STA
Ardea herodias Great Blue Heron herodias, W North America, N Mexico

0

0

-1

-1

The population estimate for C & NE N America includes the estimate for this population and also the W N Americas population.

0

0

Unknown
Ardea herodias Great Blue Heron herodias, Baja California, Mexico

0

0

-1

-1

0

0

Unknown
Ardea herodias Great Blue Heron fannini

1997

2007

9500

11000

Estimate refers to Nesting adults.

1997

2007

DEC
Ardea herodias Great Blue Heron wardi

0

0

-1

-1

1966

2000

INC
Ardea herodias Great Blue Heron occidentalis, Florida

2006

2006

1500

1500

1980

2007

DEC
Ardea herodias Great Blue Heron occidentalis, Caribbean

0

0

-1

-1

According to Birdlife International 2008a., occurs mainly as non-breeding migrant. Resident population presumably <100 individuals.

0

0

Unknown
Ardea herodias Great Blue Heron occidentalis, Central America

2005

2005

29800

122000

0

0

Unknown
Ardea herodias Great Blue Heron cognata

2004

2004

1000

1000

0

0

Unknown
Ardea cocoi Cocoi Heron South America, Panama

2005

2011

100000

1000000

2001

2010

STA
Ardea pacifica White-necked Heron Australia

2004

2011

10000

25000

Estimate based on reassessment of previous information and recent information that suggests population level may reach or exceed 25,000 only briefly.

1982

2011

FLU
Casmerodius albus Great Egret, Eastern Great Egret modestus, South Asia (non-bre)

2001

2005

25000

100000

20: 11,000 counted in South Asia in 2003.

1977

1991

STA
Casmerodius albus Great Egret, Eastern Great Egret albus, W C & SE Europe/Black Sea & Mediterranean

2006

2006

38800

54300

1996

2006

INC Wetlands International 2012. Trend 1989-2006: +3.9% p.a. – Increase.
Casmerodius albus Great Egret, Eastern Great Egret modestus, E Asia (non-bre)

2001

2001

10000

100000

20: 16,800 counted in 2004.

1987

1991

DEC
Casmerodius albus Great Egret, Eastern Great Egret albus, Western Asia/South-west Asia

2002

2002

25000

100000

1997

2007

DEC? Wetlands International 2012. Trend 1991-2007:  -2.6% p.a. – Significant long-term decline. However, most data being from only one country, Iran.
Casmerodius albus Great Egret, Eastern Great Egret modestus, Indonesia

0

0

-1

-1

0

0

Unknown
Casmerodius albus Great Egret, Eastern Great Egret melanorhynchos, Sub-Saharan Africa & Madagascar

2001

2001

100000

500000

1991

2001

INC
Casmerodius albus Great Egret, Eastern Great Egret modestus, Australia

1995

2011

25000

100000

Estimate based on review of previous information and recent information that suggests total numbers remain between 25,000 and 100,000. Numbers in New Guinea can reach the same level but likely to be mostly migrants from Australia.

1982

2011

FLU
Casmerodius albus Great Egret, Eastern Great Egret egretta, North America

0

0

270000

270000

1966

2000

INC
Casmerodius albus Great Egret, Eastern Great Egret modestus, New Zealand

0

0

100

100

0

0

Unknown
Casmerodius albus Great Egret, Eastern Great Egret egretta, Mexico

0

0

-1

-1

0

0

Unknown
Casmerodius albus Great Egret, Eastern Great Egret egretta, Central America

2005

2005

52500

180000

2005

2005

STA?
Casmerodius albus Great Egret, Eastern Great Egret egretta, Caribbean

2006

2007

11100

30500

Total of data presented in BirdLife International 2008a.

0

0

Unknown
Casmerodius albus Great Egret, Eastern Great Egret egretta, South America

2005

2011

1000000

1000001

2001

2010

STA
Mesophoyx intermedia Intermediate Egret intermedia, South Asia

0

0

25000

100000

20: 22,000 counted in South Asia in 2004.

0

0

Unknown
Mesophoyx intermedia Intermediate Egret intermedia, E, SE Asia

0

0

25000

100000

20: >10,000 counted  in 2002-2004.

0

0

Unknown
Mesophoyx intermedia Intermediate Egret brachyrhyncha, Sub-Saharan Africa

2001

2001

25000

100000

1991

2001

STA
Mesophoyx intermedia Intermediate Egret plumifera

1995

2011

100000

1000000

Numbers clearly  between 100,000 and 1,000,000 either in Australia or S New Guinea; probable migration precludes summation. Additional birds in Indonesia (no information) or failure to confirm migration would raise possibility of estimate in excess of 1,0

1982

2011

DEC? In Australia, northern colonies secure but overall likely declining trend due to loss of southernmost colonies due to river regulation for irrigation.
Ardea melanocephala Black-headed Heron Sub-Saharan Africa

2001

2001

100000

500000

1991

2001

INC
Ardea humbloti Madagascar Heron Madagascar

0

0

1000

3000

1990

2005

DEC
Ardea insignis White-bellied Heron S & SE Asia

2005

2005

250

1000

1985

2005

DEC
Ardea sumatrana Great-billed Heron SE Asia

0

0

10000

100000

1975

1985

DEC
Ardea sumatrana Great-billed Heron Australia

1999

1999

7500

7500

Occurs at low density often in habitat remote from observation; thus, data deficient. Habitat is largely unchanged and not at high risk.

1990

1999

STA
Ardea goliath Goliath Heron Sub-Saharan Africa

0

0

10000

100000

1991

2001

STA
Ardea goliath Goliath Heron SW Asia

1987

1991

50

50

0

0

Unknown
Ardea goliath Goliath Heron S Asia

1987

1991

20

20

0

0

Unknown
Ardea purpurea Purple Heron purpurea, Tropical Africa

2001

2001

75000

100000

1991

2001

STA
Ardea purpurea Purple Heron purpurea, West Europe & West Mediterranean/West Africa

1986

2008

12500

13100

1990

2008

INC BirdLife International 2004b. Population increased in the Netherlands and Italy, remained stable in  France and Portugal and fluctuated in Spain between 1990 and 2000, but increased in France by 47% between 2000 and 2008.
Ardea purpurea Purple Heron purpurea, East Europe & South-west Asia/Sub-Saharan Africa

2006

2006

135000

300000

1990

2000

DEC
Ardea purpurea Purple Heron purpurea, SW Asia (bre)

2006

2006

10000

25000

0

0

Unknown
Ardea purpurea Purple Heron madagascariensis

0

0

5000

10000

1991

2001

STA
Ardea purpurea Purple Heron bournei

0

0

1

50

1982

1992

DEC
Ardea purpurea Purple Heron manilensis, South Asia

1987

1991

25000

25000

1977

1991

STA
Ardea purpurea Purple Heron manilensis, E & SE Asia

1987

1991

10000

100000

0

0

Unknown
Bubulcus ibis Cattle Egret ibis, Southern Africa

1996

2001

100000

1000000

1986

1996

INC
Bubulcus ibis Cattle Egret ibis, Tropical Africa

1990

2001

1000000

1000001

1990

2000

STA
Bubulcus ibis Cattle Egret ibis, North-west Africa

1984

2000

100000

150000

1993

2003

INC
Bubulcus ibis Cattle Egret ibis, South-west Europe

1995

2008

260000

320000

Large increase in France between 1994 (2,300 bp) and 2008 (14,300 bp)

1995

2005

INC
Bubulcus ibis Cattle Egret ibis, East Mediterranean & South-west Asia

2005

2005

10000

100000

1997

2007

Unknown Wetlands International 2012. Trend 1990-2007: -2.1% p.a. – Uncertain.
Bubulcus ibis Cattle Egret ibis, North America

0

0

1000000

1000001

Apparently does not breed in Canada anymore, certainly not in Ontario (Weseloh, C. In litt. 2012)

1966

2000

STA
Bubulcus ibis Cattle Egret ibis, Mexico

0

0

-1

-1

0

0

Unknown
Bubulcus ibis Cattle Egret ibis, Central America

2005

2005

262000

2120000

2005

2005

INC
Bubulcus ibis Cattle Egret ibis, Caribbean

2006

2007

43800

147000

Total of data presented in BirdLife International 2008a and of which 25,000-100,000 estimated for Cuba (Acosta-Cruz, M. and Mugica-Valdés, L. 2006.)

0

0

Unknown
Bubulcus ibis Cattle Egret ibis, South America

1993

1993

1000000

1000001

1982

1992

INC
Bubulcus ibis Cattle Egret seychellarum

2001

2001

1

10000

1991

2001

STA
Bubulcus ibis Cattle Egret coromanda, South Asia

1987

1991

100000

1000001

0

0

Unknown
Bubulcus ibis Cattle Egret coromanda, E, SE Asia

2001

2001

100000

1000000

1981

1991

STA
Bubulcus ibis Cattle Egret coromanda, Oceania

1999

2011

25000

1000000

Estimate in broad range based on size of large colonies in far N Australia and status as common and locally breeding in coastal E Australia.

1982

2011

INC Ongoing, long-term trend of increase throughout population’s range.
Butorides virescens Green Heron virescens, Central & E North America

0

0

-1

-1

1966

2000

DEC
Butorides virescens Green Heron virescens, Mexico

0

0

-1

-1

0

0

Unknown
Butorides virescens Green Heron virescens, Central America

2005

2005

23000

60000

0

0

Unknown
Butorides virescens Green Heron virescens, Caribbean

2006

2007

3080

12300

Total of data presented in BirdLife International 2008a

0

0

Unknown
Butorides virescens Green Heron bahamensis

0

0

-1

-1

0

0

Unknown
Butorides virescens Green Heron anthonyi

0

0

-1

-1

1966

2000

INC
Butorides virescens Green Heron frazari

0

0

-1

-1

0

0

Unknown
Butorides striata Striated Heron striata, Central & South America

0

0

-1

-1

0

0

Unknown
Butorides striata Striated Heron striata, South America

2005

2011

100000

1000000

2001

2010

STA
Butorides striata Striated Heron sundevalli

0

0

-1

-1

0

0

Unknown
Butorides striata Striated Heron brevipes

0

0

1

25000

Widespread in the whole of the Red Sea and the Gulf of Aden (528); birds on Indian Ocean coast of N Somalia are probably this form (18).

0

0

Unknown
Butorides striata Striated Heron atricapilla

2001

2001

100000

1000000

1991

2001

STA
Butorides striata Striated Heron rutenbergi

2001

2001

1

25000

1991

2001

STA
Butorides striata Striated Heron rhizophorae

2001

2001

1

10000

1992

2002

STA
Butorides striata Striated Heron degens

2001

2001

1

10000

0

0

Unknown
Butorides striata Striated Heron crawfordi

2001

2001

1

5000

1991

2001

STA
Butorides striata Striated Heron albolimbata

0

0

1

10000

0

0

Unknown
Butorides striata Striated Heron chloriceps

0

0

25000

25000

1991

2001

DEC
Butorides striata Striated Heron spodiogaster

0

0

-1

-1

0

0

Unknown
Butorides striata Striated Heron amurensis

0

0

-1

-1

0

0

Unknown
Butorides striata Striated Heron actophila

0

0

-1

-1

0

0

Unknown
Butorides striata Striated Heron javanica

2006

2006

10000

100000

0

0

Unknown
Butorides striata Striated Heron moluccara, Moluccas

0

0

-1

-1

0

0

Unknown
Butorides striata Striated Heron moluccara, NW New Guinea

0

0

-1

-1

0

0

Unknown
Butorides striata Striated Heron solomonensis

2001

2001

1

25000

0

0

Unknown
Butorides striata Striated Heron idenburgi

0

0

-1

-1

0

0

Unknown
Butorides striata Striated Heron flyensis

0

0

-1

-1

0

0

Unknown
Butorides striata Striated Heron stagnatilis, N Australia

0

0

-1

-1

0

0

Unknown
Butorides striata Striated Heron stagnatilis, NW Australia

0

0

-1

-1

0

0

Unknown
Butorides striata Striated Heron stagnatilis, NE Western Australia

0

0

-1

-1

0

0

Unknown
Butorides striata Striated Heron patruelis

0

0

100

200

1971

1987

DEC
Butorides striata Striated Heron macrorhynchus, E Australia

0

0

-1

-1

0

0

Unknown
Butorides striata Striated Heron macrorhynchus, SC New Guinea, NE Queensland

0

0

-1

-1

0

0

Unknown
Butorides striata Striated Heron carcinophilus

0

0

-1

-1

0

0

Unknown
Butorides striata Striated Heron steini

0

0

-1

-1

0

0

Unknown
Ardeola ralloides Squacco Heron ralloides, SW Europe NW Africa (bre)

1995

2005

2700

5600

1995

2005

INC
Ardeola ralloides Squacco Heron ralloides, C & E Europe/Black Sea & E Mediterranean (bre)

1995

2005

42000

76000

1995

2005

DEC
Ardeola ralloides Squacco Heron ralloides, West & South-west Asia/Sub-Saharan Africa

1987

1991

25000

100000

1990

2000

STA
Ardeola ralloides Squacco Heron paludivaga, Sub-Saharan Africa & Madagascar

2006

2006

300000

600000

1991

2001

INC? Trolliet, B. In litt. 2011. The trend is increasing in Lake Chad Basin as in Inner Niger Delta.
Ardeola grayii Indian Pond-heron grayii, SW, S Asia

1987

1991

100000

1000000

0

0

Unknown
Ardeola grayii Indian Pond-heron grayii, Myanmar, Bay of Bengal

0

0

-1

-1

0

0

Unknown
Ardeola grayii Indian Pond-heron phillipsi

0

0

-1

-1

0

0

Unknown
Ardeola bacchus Chinese Pond-heron E, SE & S Asia

2001

2001

25000

1000000

1981

1991

STA
Ardeola speciosa Javan Pond-heron speciosa

0

0

-1

-1

0

0

Unknown
Ardeola speciosa Javan Pond-heron continentalis

1987

1991

10000

100000

0

0

Unknown
Ardeola idae Madagascar Pond-heron Madagascar & Aldabra/Central & Eastern Africa

2001

2001

2000

6000

1995

2005

DEC
Ardeola rufiventris Rufous-bellied Heron Tropical Eastern & Southern Africa

2006

2006

10000

100000

1990

2000

STA
Egretta rufescens Reddish Egret rufescens, S USA

1991

2006

5000

7000

Green 2006. 1,215-1,330 breeding pairs in southern USA; 800-1,000 breeding pairs in Mexico (inc. dickeyi); 200 breeding pairs in Bahamas.

1991

2006

DEC
Egretta rufescens Reddish Egret rufescens, Mexico

0

0

1

10000

0

0

Unknown
Egretta rufescens Reddish Egret rufescens, Central America

2006

2006

1

10000

Green, C. In litt. 2012. 282 breeding pairs in southern Mexico (Chiapas, Oaxaca in 2007-2008) and 95 breeding pairs in Tamaulipas (in 2008). 

0

0

Unknown
Egretta rufescens Reddish Egret rufescens, Caribbean

2006

2010

213

213

Data from Bahamas: 50 bp in Great Inagua, 19 bp in Grand Bahama, 2 bp in Bimini Island.

0

0

Unknown
Egretta rufescens Reddish Egret rufescens, N South America

0

0

1

10000

0

0

Unknown
Egretta rufescens Reddish Egret dickeyi

2007

2008

2250

2260

753 Breeding Pairs.

0

0

Unknown
Ardea picata Pied Heron Australia – Sulawesi

1995

2002

25000

100000

Estimate based on high counts in S New Guinea, and numbers breeding in far N Australia, which although not necessarily additive nevertheless suggest overall numbers in the range 25,000-100,000..

2000

2010

STA Trend assumed stable based on habitat in Australia and New Guinea being mostly near-natural.
Egretta vinaceigula Slaty Egret South-central Africa

2005

2005

3000

5000

1995

2005

DEC
Egretta ardesiaca Black Heron Sub-Saharan Africa

1999

1999

25000

100000

1990

2000

INC? 920. Since the mid 1980’s, numbers are locally increasing.
Egretta tricolor Tricoloured Heron tricolor

0

0

-1

-1

0

0

Unknown
Egretta tricolor Tricoloured Heron ruficollis, USA (bre)

0

0

293000

293000

1966

2000

STA
Egretta tricolor Tricoloured Heron ruficollis, Mexico

2006

2006

1

1500

0

0

Unknown No new data
Egretta tricolor Tricoloured Heron ruficollis, Central America

2005

2005

3350

6800

0

0

Unknown
Egretta tricolor Tricoloured Heron ruficollis, Caribbean

2006

2007

12000

27400

Total of data presented in BirdLife International 2008a and of which 10,000-25,000 estimated for Cuba (Acosta-Cruz, and Mugica-Valdés 2006).

0

0

Unknown
Egretta novaehollandiae White-faced Heron novaehollandiae

2004

2008

10000

100000

Estimate based on summed maximum counts indicating at least 10,000 birds and common status (at low density) across dryland habitats; much habitat is not surveyed.

0

0

Unknown
Egretta novaehollandiae White-faced Heron parryi

0

0

-1

-1

0

0

Unknown
Egretta caerulea Little Blue Heron North America

0

0

225000

300000

1966

2000

DEC
Egretta caerulea Little Blue Heron Mexico

0

0

75000

150000

0

0

Unknown
Egretta caerulea Little Blue Heron Central America

2005

2005

701

1500

0

0

Unknown
Egretta caerulea Little Blue Heron Caribbean

2006

2007

12300

35900

Total of data presented in BirdLife International 2008a.

0

0

Unknown
Egretta caerulea Little Blue Heron South America

2005

2011

100000

100000

2001

2010

STA?
Egretta thula Snowy Egret thula

0

0

215000

215000

1982

1992

STA
Egretta thula Snowy Egret thula, Mexico

0

0

75000

150000

0

0

Unknown
Egretta thula Snowy Egret thula, Central America

2005

2005

11300

26900

0

0

Unknown
Egretta thula Snowy Egret thula,Caribbean

2006

2007

12500

36100

Total of data presented in BirdLife International 2008a.

0

0

Unknown
Egretta thula Snowy Egret thula, South America

2005

2011

300000

1000000

2001

2010

STA
Egretta thula Snowy Egret brewsteri

2006

2006

100000

1000000

1966

2000

INC
Egretta garzetta Little Egret garzetta, Sub-Saharan Africa

2001

2001

200000

500000

1990

2000

STA
Egretta garzetta Little Egret garzetta, Western Europe NW Africa

1998

1998

125000

143000

1997

2007

INC Wetlands International 2012. Trend 1990-2007: +7.9% p.a. – Increase.
Egretta garzetta Little Egret garzetta, Central & E Europe Black Sea E Mediterranean

1986

1997

44000

72400

1988

1998

STA
Egretta garzetta Little Egret garzetta, Western Asia/SW Asia NE & Eastern Africa

1987

1991

25000

100000

1997

2007

Unknown Wetlands International 2012. Trend 1992-2007: +1% p.a. – Uncertain.
Egretta garzetta Little Egret garzetta, South Asia

0

0

100000

200000

20: 48,000 counted in 2002.

0

0

Unknown
Egretta garzetta Little Egret garzetta, E, SE Asia

2001

2001

100000

1000000

1981

1991

STA
Egretta garzetta Little Egret garzetta, West Indies

2006

2006

30

60

Colonised in early 1990s, (529). 10-20 pairs (30-60 individuals). See 336.

1991

2001

INC
Egretta garzetta Little Egret nigripes

1987

1991

25000

1000001

0

0

Unknown
Egretta garzetta Little Egret immaculata

2002

2004

25000

100000

Estimate based on review of previous information and some recent information, which suggest that total numbers in Australia and S New Guinea are between 25,000 and 100,000, assuming most of the S New Guinea birds are immaculata. If immaculata and nigripes

0

0

Unknown
Egretta garzetta Little Egret dimorpha, Madagascar

0

0

6000

20000

0

0

DEC
Egretta garzetta Little Egret dimorpha, Aldabra & Amirante Is

0

0

3000

9000

1991

2001

STA
Egretta garzetta Little Egret dimorpha, E African coast

2001

2001

10000

10000

1991

2001

STA
Egretta gularis Western Reef-egret gularis, West Africa

1990

2000

10000

100000

1991

2001

STA
Egretta gularis Western Reef-egret schistacea, North-east Africa & Red Sea

1990

2000

10000

100000

1990

2000

STA
Egretta gularis Western Reef-egret schistacea, South-west Asia & South Asia

1987

1991

17000

17000

1990

2000

STA
Egretta eulophotes Chinese Egret E, SE Asia

2000

2010

3000

4100

Hwang (2011) estimates 1,000-1,600 breeding individuals in South Korea from 2000 to 2010, 1,000-1,200 (Collar 2001) or 1,200-1,500 (BASP 2004) in DPRK, and 1,000 birds in China (Zhiying 2009).

0

0

STA
Egretta sacra Pacific Reef-egret sacra

2006

2006

100000

1000000

Regarded as ‘rapidly declining and very rare’ in China (125).

1985

2005

STA? Regarded as ‘rapidly declining and very rare’ in China (125).
Egretta sacra Pacific Reef-egret albolineata

0

0

1000

2000

1990

2000

STA
Syrigma sibilatrix Whistling Heron sibilatrix

2005

2011

25000

100000

2001

2010

STA
Syrigma sibilatrix Whistling Heron forstersmithi

2011

2011

10000

10000

2006

2010

FLU
Pilherodius pileatus Capped Heron C & S America

2005

2011

10000

25000

2001

2010

STA
Nyctanassa violacea Yellow-crowned Night-heron violacea, North America

0

0

75000

150000

1966

2000

STA
Nyctanassa violacea Yellow-crowned Night-heron violacea, Mexico to Honduras

0

0

-1

-1

No new data other than estimate of 1,400-1,900 for Central America (Komar et al.  2006).

0

0

Unknown
Nyctanassa violacea Yellow-crowned Night-heron violacea, Socorro Island

0

0

-1

-1

0

0

Unknown
Nyctanassa violacea Yellow-crowned Night-heron caliginis

2004

2004

900

900

1982

1992

STA
Nyctanassa violacea Yellow-crowned Night-heron cayennensis

0

0

-1

-1

0

0

Unknown
Nyctanassa violacea Yellow-crowned Night-heron bancrofti

0

0

-1

-1

No new data other than estimate of 2,203-7,603 for Caribbean (Birdlife International 2008a).

0

0

Unknown
Nyctanassa violacea Yellow-crowned Night-heron pauper

0

0

-1

-1

0

0

Unknown
Nycticorax nycticorax Black-crowned Night-heron nycticorax, W Europe NW Africa (bre)

2000

2005

61000

97000

1990

2000

INC BirdLife International 2004b. Increased in France and Belgium, declined in Portugal, stable in other countries between 1990 and 2000. Depleted.
Nycticorax nycticorax Black-crowned Night-heron nycticorax, C & E Europe/Black Sea & E Mediterranean (bre)

1990

2000

92100

138000

1990

2000

INC BirdLife International 2004b. Increased in Turkey and Serbia, declines in Slovenia, Bosnia-Herzegovina and Albania, stable in other countries between 1990 and 2000. The breeding population also declined in Greece during the same period (Yfantis and Kazant
Nycticorax nycticorax Black-crowned Night-heron nycticorax, Western Asia/SW Asia & NE Africa

2002

2002

25000

100000

1990

2000

STA
Nycticorax nycticorax Black-crowned Night-heron nycticorax, Sub-Saharan Africa & Madagascar

2001

2001

25000

1000000

1991

2001

STA
Nycticorax nycticorax Black-crowned Night-heron nycticorax, South Asia

0

0

100000

150000

33: Population estimate for India 100,000.

1977

1991

STA
Nycticorax nycticorax Black-crowned Night-heron nycticorax, E, SE Asia

2006

2006

100000

1000000

1981

1991

STA
Nycticorax nycticorax Black-crowned Night-heron nycticorax, North America (bre)

1999

2011

75000

150000

2,500-5,000 breeding pairs estimated for Canada (Weseloh, C. In litt. 2012).

1990

2000

STA
Nycticorax nycticorax Black-crowned Night-heron nycticorax, Mexico

0

0

-1

-1

0

0

Unknown
Nycticorax nycticorax Black-crowned Night-heron nycticorax, Central America

2005

2005

9600

24900

0

0

Unknown
Nycticorax nycticorax Black-crowned Night-heron nycticorax, Caribbean

2006

2007

6000

12300

Total of data presented in BirdLife International 2008a.

0

0

Unknown
Nycticorax nycticorax Black-crowned Night-heron nycticorax, northern South America (bre)

2005

2010

50000

50000

2001

2010

STA
Nycticorax nycticorax Black-crowned Night-heron obscurus

2001

2001

25000

1000000

0

0

Unknown
Nycticorax nycticorax Black-crowned Night-heron obscurus, Falkland Islands (Malvinas)

0

0

5700

10800

718 estimate 1,900-3,600 pairs (5,700-10,800 individuals).

0

0

Unknown
Nycticorax duboisi Reunion Night-heron Reunion

2005

2005

0

0

Described and last recorded in 1674 (BirdLife International. 2005).

1750

2005

EXT
Nycticorax mauritianus Mauritius Night-heron Mauritius

2005

2005

0

0

Described and last recorded in 1693 (BirdLife International. 2005).

1750

2005

EXT
Nycticorax megacephalus Rodrigues Night-heron Rodrigues

2005

2005

0

0

Described and last recorded in 1726 (BirdLife International. 2005).

1800

2005

EXT
Gorsachius leuconotus White-backed Night-heron Africa

0

0

25000

100000

1991

2001

STA
Nycticorax caledonicus Rufous Night-heron caledonicus

0

0

2000

4000

1990

2000

STA
Nycticorax caledonicus Rufous Night-heron manillensis

0

0

-1

-1

0

0

Unknown
Nycticorax caledonicus Rufous Night-heron pelewensis

2001

2001

1

10000

0

0

Unknown
Nycticorax caledonicus Rufous Night-heron mandibularis

2001

2001

10000

100000

0

0

Unknown
Nycticorax caledonicus Rufous Night-heron hilli

2004

2011

25000

1000000

Estimate based on numbers in colonies and consideration of survey difficulties and numbers outside Australia.

1982

2011

FLU Trend is fluctuating; possible long-term decline due to loss of some breeding habitat in E Australia requires confirmation.
Gorsachius magnificus White-eared Night-heron SE Asia

2000

2000

250

1000

M. Crosby in litt. (2005) estimates 250-999 individuals based on analysis of information presented in 66. Habitat detrimentally transformed at principal site, Shennongjia in Hubei province, China, in 1990s.

1995

2005

DEC
Gorsachius goisagi Japanese Night-heron E & SE Asia

2005

2005

250

1000

1975

1995

DEC
Gorsachius melanolophus Malaysian Night-heron South Asia

0

0

-1

-1

0

0

Unknown
Gorsachius melanolophus Malaysian Night-heron SE Asia

0

0

-1

-1

0

0

Unknown
Gorsachius melanolophus Malaysian Night-heron Philippines

0

0

-1

-1

0

0

Unknown
Gorsachius melanolophus Malaysian Night-heron Palawan, Philippines

0

0

1

10000

0

0

Unknown
Gorsachius melanolophus Malaysian Night-heron Nicobar Is

0

0

1

10000

0

0

Unknown
Botaurus pinnatus Pinnated Bittern pinnatus

2005

2011

10000

25000

No new data other than estimate of 576-2,900 for Central America (Komar et al. 2006).

2001

2010

STA
Botaurus pinnatus Pinnated Bittern caribaeus

0

0

-1

-1

0

0

Unknown
Botaurus lentiginosus American Bittern North America

2000

2000

2980000

2980000

Estimate from BBS 992,000 pairs (2,976,000 individuals). For populations over 2 million birds, Ramsar criterion 5 (20,000 or more waterbirds) applies.

1966

2004

DEC?
Botaurus stellaris Great Bittern stellaris, W Europe NW Africa (bre)

1983

1999

5850

6700

1995

2005

DEC
Botaurus stellaris Great Bittern stellaris, C & E Europe Black Sea & E Mediterranean (bre)

1993

1993

53800

125000

1995

2005

DEC
Botaurus stellaris Great Bittern stellaris, South-west Asia (win)

2006

2006

25000

100000

1990

2000

STA
Botaurus stellaris Great Bittern stellaris, South Asia (non-bre)

0

0

-1

-1

0

0

Unknown
Botaurus stellaris Great Bittern stellaris, S & E Asia (non-bre)

2001

2001

25000

100000

1981

1991

DEC
Botaurus stellaris Great Bittern capensis, Southern Africa

1990

2000

5000

5000

1986

1996

DEC
Botaurus poiciloptilus Australasian Bittern SW Australia

2009

2010

60

230

Estimate derived by WPE method of number of mature birds x1.5 and based on systematic range-wide surveys in recent years coordinated by BirdLife Australia.

2000

2010

DEC Trend is declining (20-30% within 2 generations (11 years)) due to loss of habitat.
Botaurus poiciloptilus Australasian Bittern SE Australia

2009

2010

310

960

Estimate derived by WPE method of number of mature birds x1.5 and based on systematic range-wide surveys in recent years coordinated by BirdLife Australia.

2000

2010

DEC Trend is declining (20-30% within 2 generations (11 years)) due to loss of habitat.
Botaurus poiciloptilus Australasian Bittern New Zealand

2011

2011

1000

1500

Estimate reflects better information arising from systematic investigation.

2001

2010

DEC? Trend assumed to be unchanged but requires confirmation.
Botaurus poiciloptilus Australasian Bittern New Caledonia

2011

2011

-1

-1

2001

2010

EXT?
Ixobrychus involucris Stripe-backed Bittern N South America

1993

1993

100000

1000000

1982

1992

STA
Ixobrychus involucris Stripe-backed Bittern S South America

2011

2011

10000

25000

2001

2010

STA
Ixobrychus exilis Least Bittern exilis

2000

2000

128000

128000

No new data. 4,500 (1,500 Bpairs) in Canada (COSEWIC. 2009).

0

0

Unknown
Ixobrychus exilis Least Bittern pullus

0

0

-1

-1

0

0

Unknown
Ixobrychus exilis Least Bittern bogotensis

2011

2011

1000

1000

2001

2010

DEC
Ixobrychus exilis Least Bittern erythromelas

2005

2011

10000

25000

0

0

Unknown
Ixobrychus exilis Least Bittern peruvianus

2011

2011

1000

5000

2001

2010

STA
Ixobrychus minutus Little Bittern minutus, W Europe NW Africa/Subsaharan Africa

2000

2005

11900

17900

1995

2005

STA BirdLife International 2004b. Stable or increased in all countries except Portugal between 1990 and 2000. Probably depleted.
Ixobrychus minutus Little Bittern minutus, C & E Europe Black Sea & E Mediterranean/Subsaharan Africa

1995

2005

110000

325000

1995

2005

DEC
Ixobrychus minutus Little Bittern minutus, West & South-west Asia/Sub-Saharan Africa

1987

1991

25000

100000

1990

2000

STA
Ixobrychus minutus Little Bittern minutus, South Asia

1987

1991

10000

25000

0

0

Unknown
Ixobrychus minutus Little Bittern payesii, Sub-Saharan Africa

1990

2000

25000

100000

1990

2000

STA
Ixobrychus minutus Little Bittern podiceps

0

0

3000

15000

0

0

Unknown
Ixobrychus minutus Little Bittern dubius

1994

2010

1

10000

Data inadequate to derive a numerical estimate due to survey difficulties; numbers recorded support 1 – 10,000.

1982

2011

DEC? Trend is possibly declining due to loss of inland habitat.
Ixobrychus novaezelandiae Black-backed Bittern, Australian Little Bittern New Zealand

0

0

0

0

1982

1992

EXT
Ixobrychus sinensis Yellow Bittern Seychelles

0

0

1

300

1991

2001

DEC
Ixobrychus sinensis Yellow Bittern South Asia

0

0

-1

-1

0

0

Unknown
Ixobrychus sinensis Yellow Bittern E & SE Asia

2006

2006

100000

1000000

42: Recently colonised New Caledonia.

1985

2005

INC
Ixobrychus eurhythmus Schrenck’s Bittern E & SE Asia

0

0

1

25000

1985

1995

DEC
Ixobrychus cinnamomeus Cinnamon Bittern South Asia

1987

1991

25000

1000000

0

0

Unknown
Ixobrychus cinnamomeus Cinnamon Bittern E, SE Asia

2006

2006

100000

1000000

1985

2005

STA
Ixobrychus sturmii Dwarf Bittern Sub-Saharan Africa

1990

2000

25000

100000

1990

2000

STA
Ixobrychus flavicollis Black Bittern flavicollis, South Asia

1987

1991

25000

100000

0

0

Unknown
Ixobrychus flavicollis Black Bittern flavicollis, E, SE Asia

2006

2006

10000

100000

0

0

Unknown
Ixobrychus flavicollis Black Bittern australis, Australia, New Guinea

1999

2002

10000

100000

Estimate based on previous information and extent of habitat across several countries.

1991

2000

DEC
Ixobrychus flavicollis Black Bittern australis, Timor

0

0

-1

-1

0

0

Unknown
Ixobrychus flavicollis Black Bittern australis, Rennell Island

2001

2001

1

500

0

0

Unknown
Ixobrychus flavicollis Black Bittern australis, New Britain, New Ireland

2001

2001

1

10000

0

0

Unknown
Ixobrychus flavicollis Black Bittern woodfordi

2001

2001

1

10000

0

0

Unknown
Zebrilus undulatus Zigzag Heron South America

2004

2004

1

10000

0

0

Unknown
Tigrisoma mexicanum Bare-throated Tiger-heron Colombia to Mexico

2005

2005

17100

47500

2005

2005

INC
Tigrisoma mexicanum Bare-throated Tiger-heron S Mexico

0

0

-1

-1

0

0

Unknown
Tigrisoma fasciatum Fasciated Tiger-heron fasciatum

0

0

1

10000

0

0

Unknown
Tigrisoma fasciatum Fasciated Tiger-heron salmoni

2005

2005

2520

5050

Estimate for whole of Central America.

0

0

Unknown
Tigrisoma fasciatum Fasciated Tiger-heron pallescens

2004

2004

2000

2000

0

0

Unknown
Tigrisoma lineatum Rufescent Tiger-heron lineatum

2005

2005

2700

5500

Estimate for whole of Central America.

0

0

Unknown
Tigrisoma lineatum Rufescent Tiger-heron marmoratum

2005

2011

25000

100000

2001

2010

STA
Agamia agami Agami Heron C & S America

2005

2011

10000

25000

0

0

Unknown
Zonerodius heliosylus Forest Bittern New Guinea

2006

2006

1

10000

Very difficult to detect and invariably overlooked; thus virtually unknown in the wild (Bishop 2003).

1985

2005

DEC
Tigriornis leucolopha White-crested Tiger-heron W & C Africa

2006

2006

25000

100000

0

0

Unknown
Cochlearius cochlearius Boat-billed Heron cochlearia

2011

2011

25000

100000

2001

2010

DEC
Cochlearius cochlearius Boat-billed Heron zeledoni

0

0

-1

-1

0

0

Unknown
Cochlearius cochlearius Boat-billed Heron phillipsi

2005

2005

14800

46300

Estimate for whole of Central America.

0

0

Unknown
Cochlearius cochlearius Boat-billed Heron ridgwayi

0

0

-1

-1

0

0

Unknown
Cochlearius cochlearius Boat-billed Heron panamensis

0

0

-1

-1

0

0

Unknown