Sbarnhardt (talk | contribs) (Add Hughv Display - Plumage image to Behavior section, Moved David Roach Mature Adult image to Distribution section,) |
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:*Blue lores | :*Blue lores | ||
*Juveniles have elongated spots and stripes on their neck and upper breast area | *Juveniles have elongated spots and stripes on their neck and upper breast area | ||
| + | [[Image:DSC 3940 GR.jpg|thumb|350px|right|Juvenile<br />Photo © by {{user|Grobertson|Grobertson}}<br />Henderson Bird Preserve, Las Vegas, 13 March 2017]] | ||
===="Great White" Heron==== | ===="Great White" Heron==== | ||
| − | [[Image: | + | [[Image:497385751.jpg|thumb|350px|right|White morph; subspecies ''occidentalis'' <br />Photo © by {{user|jmorlan|Joseph Morlan}}<br />Piermont Marsh, Piermont, [[New York]], [[USA]], 16 October 2022.]] |
There is also an all white version of the Great Blue Heron, the "Great White" Heron. The great white heron was originally described as a distinct species, but is currently considered to be the white morph of Great Blue Heron. The "Great White" differs from the the Great Blue in bill morphology, head plume length, and in having a total lack of pigment in its plumage. The form is found nearly exclusively in marine waters along the coast of S. Florida. It can be seen in other regions of Florida and the Caribbean although not common. It has yellow legs, a yellow bill and white feathers. | There is also an all white version of the Great Blue Heron, the "Great White" Heron. The great white heron was originally described as a distinct species, but is currently considered to be the white morph of Great Blue Heron. The "Great White" differs from the the Great Blue in bill morphology, head plume length, and in having a total lack of pigment in its plumage. The form is found nearly exclusively in marine waters along the coast of S. Florida. It can be seen in other regions of Florida and the Caribbean although not common. It has yellow legs, a yellow bill and white feathers. | ||
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====Similar species==== | ====Similar species==== | ||
| − | |||
The risk of misidentification is greatest for the "Great White Heron" type, and here are some pointers for each of a number of possible mistakes: | The risk of misidentification is greatest for the "Great White Heron" type, and here are some pointers for each of a number of possible mistakes: | ||
*[[Great Egret]] has yellow bill but black legs (yellow legs in Great White Heron) | *[[Great Egret]] has yellow bill but black legs (yellow legs in Great White Heron) | ||
*[[Snowy Egret]]s have a black bill and black legs, both of which are wrong for this species (do look at juveniles that are less clear-cut) and the bill is finer and more pointed | *[[Snowy Egret]]s have a black bill and black legs, both of which are wrong for this species (do look at juveniles that are less clear-cut) and the bill is finer and more pointed | ||
| − | *[[Cattle Egret]] would have a much smaller bill and shorter legs | + | *[[Western Cattle Egret]] would have a much smaller bill and shorter legs |
*Juvenile [[Little Blue Heron]] or white morph [[Reddish Egret]] would not have a yellow bill or yellow on the legs. | *Juvenile [[Little Blue Heron]] or white morph [[Reddish Egret]] would not have a yellow bill or yellow on the legs. | ||
==Distribution== | ==Distribution== | ||
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[[File:Wurdemann's HeronZD.jpg|thumb|350px|right|Wurdemann's heron (intergrade between Great Blue Heron and Great White Heron)<br />Photo © by {{user|Zackiedawg|Zackiedawg}}<br />Delray Beach, [[Florida]], 21 January 2012]] | [[File:Wurdemann's HeronZD.jpg|thumb|350px|right|Wurdemann's heron (intergrade between Great Blue Heron and Great White Heron)<br />Photo © by {{user|Zackiedawg|Zackiedawg}}<br />Delray Beach, [[Florida]], 21 January 2012]] | ||
====Subspecies==== | ====Subspecies==== | ||
| − | |||
Five subspecies are recognized<sup>[[#References|[1]]]</sup>: | Five subspecies are recognized<sup>[[#References|[1]]]</sup>: | ||
* ''A.h. fannini'': | * ''A.h. fannini'': | ||
| Line 49: | Line 48: | ||
:*[[Galapagos Islands]] | :*[[Galapagos Islands]] | ||
==Habitat== | ==Habitat== | ||
| − | |||
Margins of lakes and slow-flowing rivers, swamps and marshes, frequently on sea-coasts, in estuaries and mangroves. | Margins of lakes and slow-flowing rivers, swamps and marshes, frequently on sea-coasts, in estuaries and mangroves. | ||
==Behaviour== | ==Behaviour== | ||
| − | |||
====Actions==== | ====Actions==== | ||
Usually tucks its head into an S-shape when it is resting and flying. | Usually tucks its head into an S-shape when it is resting and flying. | ||
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====Movements==== | ====Movements==== | ||
Marked post-breeding dispersal in North America, especially in North-Center of continent. | Marked post-breeding dispersal in North America, especially in North-Center of continent. | ||
| + | ==Gallery== | ||
| + | Click on photo for larger image | ||
| + | <gallery> | ||
| + | File:Great_Blue_Heron_Flight_ZAC.jpg|Photo © by {{user|Zackiedawg|Zackiedawg}}<br /> Delray Beach, [[Florida]], [[USA]], 11 February 2017 | ||
| + | File:Great_Blue_Heron_Back_STM.jpg|Photo © by {{user|STM|STM}}<br />Charleston, [[South Carolina]], [[USA]], 13 April 2021 | ||
| + | File:Great_Blue_Heron_Display-Plumage_HUGHV.jpg|Display - Plumage<br />Photo © by {{user|Hughv|Hughv}}<br />Quiet Waters Park, Annapolis, [[Maryland]], [[USA]], 16 May 2021 | ||
| + | </gallery> | ||
==References== | ==References== | ||
| − | #{{Ref- | + | #{{Ref-Clements6thOct22}}#Martínez-Vilalta, A., Motis, A. & Kirwan, G.M. (2020). Great Blue Heron (''Ardea herodias''). In: del Hoyo, J., Elliott, A., Sargatal, J., Christie, D.A. & de Juana, E. (eds.). Handbook of the Birds of the World Alive. Lynx Edicions, Barcelona. (retrieved from https://www.hbw.com/node/52675 on 25 February 2020). |
#[http://www.birdforum.net/showthread.php?p=1581195 Thread] in the id forum discussing the "Great White" form | #[http://www.birdforum.net/showthread.php?p=1581195 Thread] in the id forum discussing the "Great White" form | ||
#BirdForum Member observations | #BirdForum Member observations | ||
| Line 74: | Line 78: | ||
==External Links== | ==External Links== | ||
| − | {{GSearch|Ardea | + | {{GSearch|"Ardea herodias" {{!}} "Great Blue Heron"}} |
<br /> | <br /> | ||
| − | {{ | + | {{VSearch|"Ardea herodias" {{!}} "Great Blue Heron"}} |
| − | [[Category:Birds]] [[Category:Ardea | + | {{GS-checked}}1 |
| + | <br /> | ||
| + | <br /> | ||
| + | |||
| + | [[Category:Birds]] [[Category:Ardea]] | ||
Latest revision as of 02:05, 14 April 2024
- Ardea herodias
Identification
A first year bird, subspecies A. h. wardi
Photo © by David Roach
Wakodahatchee, Florida, 15 November 2018
Photo © by David Roach
Wakodahatchee, Florida, 15 November 2018
Ht. 3-4ft 5 in (91–137 cm)
W. 6ft
- Blue-gray feathers on most of its body
- Long, pointed yellow bill
- Long legs
- Adults have white on the top of their heads and long black plumes above their eyes
Breeding plumage
- Plume of feathers on its chest and back
- Black and chestnut shoulder patch (sometimes retained all year)
- Blue lores
- Juveniles have elongated spots and stripes on their neck and upper breast area
"Great White" Heron
White morph; subspecies occidentalis
Photo © by Joseph Morlan
Piermont Marsh, Piermont, New York, USA, 16 October 2022.
Photo © by Joseph Morlan
Piermont Marsh, Piermont, New York, USA, 16 October 2022.
There is also an all white version of the Great Blue Heron, the "Great White" Heron. The great white heron was originally described as a distinct species, but is currently considered to be the white morph of Great Blue Heron. The "Great White" differs from the the Great Blue in bill morphology, head plume length, and in having a total lack of pigment in its plumage. The form is found nearly exclusively in marine waters along the coast of S. Florida. It can be seen in other regions of Florida and the Caribbean although not common. It has yellow legs, a yellow bill and white feathers.
Where the dark and white forms overlap in Florida, intermediate birds known as "Wurdemann's Herons" can be found. It is very rare and confined to extreme southern Florida and the Florida Keys. The birds white head and blue blody form resembles a Great Blue Heron (Florida race) with a white upper neck and head and it lacks the black plumes of the nominate race.
Similar species
The risk of misidentification is greatest for the "Great White Heron" type, and here are some pointers for each of a number of possible mistakes:
- Great Egret has yellow bill but black legs (yellow legs in Great White Heron)
- Snowy Egrets have a black bill and black legs, both of which are wrong for this species (do look at juveniles that are less clear-cut) and the bill is finer and more pointed
- Western Cattle Egret would have a much smaller bill and shorter legs
- Juvenile Little Blue Heron or white morph Reddish Egret would not have a yellow bill or yellow on the legs.
Distribution
Mature adult, subspecies A. h. wardi
Photo © by David Roach
Wakodahatchee, Florida, USA, 26 November 2018
Photo © by David Roach
Wakodahatchee, Florida, USA, 26 November 2018
It is found throughout most of North America, including Alaska, Quebec and Nova Scotia. The range extends south through Florida, Mexico and the Caribbean to South America.
Very rare vagrant to the Azores and United Kingdom.
Migrates in the fall, although some stay in the northern part of their range.
Taxonomy
Wurdemann's heron (intergrade between Great Blue Heron and Great White Heron)
Photo © by Zackiedawg
Delray Beach, Florida, 21 January 2012
Photo © by Zackiedawg
Delray Beach, Florida, 21 January 2012
Subspecies
Five subspecies are recognized[1]:
- A.h. fannini:
- South-eastern Alaska to coastal Washington
- A.h. herodias:
- Southern Canada to southern Baja California and Central America
- A.h. wardi:
- A.h. occidentalis:
- Southern Florida through West Indies to islands off Venezuela
- A.h. cognata:
Habitat
Margins of lakes and slow-flowing rivers, swamps and marshes, frequently on sea-coasts, in estuaries and mangroves.
Behaviour
Actions
Usually tucks its head into an S-shape when it is resting and flying.
Diet
Their main diet consists of fish.
Breeding
Colonial. Nest usually in a tree built primary from sticks, but when nesting on the ground can also use other materials such as Salt Grass. Clutch is usually two to three pale blue eggs.
Vocalisation
Common call is a rapid squawk given day and night when alarmed or when being aggressive.
Movements
Marked post-breeding dispersal in North America, especially in North-Center of continent.
Gallery
Click on photo for larger image
Photo © by Zackiedawg
Delray Beach, Florida, USA, 11 February 2017
Photo © by STM
Charleston, South Carolina, USA, 13 April 2021
References
- Clements, J. F., T. S. Schulenberg, M. J. Iliff, T. A. Fredericks, J. A. Gerbracht, D. Lepage, S. M. Billerman, B. L. Sullivan, and C. L. Wood. 2022. The eBird/Clements checklist of Birds of the World: v2022. Downloaded from https://www.birds.cornell.edu/clementschecklist/download/
- Martínez-Vilalta, A., Motis, A. & Kirwan, G.M. (2020). Great Blue Heron (Ardea herodias). In: del Hoyo, J., Elliott, A., Sargatal, J., Christie, D.A. & de Juana, E. (eds.). Handbook of the Birds of the World Alive. Lynx Edicions, Barcelona. (retrieved from https://www.hbw.com/node/52675 on 25 February 2020).
- Thread in the id forum discussing the "Great White" form
- BirdForum Member observations
- Blake, E. R. 1977. Manual of Neotropical Birds. Volume 1. University of Chicago Press, Chicago, Illinois.
- Hancock, J. & H. Elliott (1978) The Herons of the World. Harper & Row
- Palmer, R. (1962) Handbook of North American Birds, Vol 1: Loons through Flamingos. Yale Univ. Press.
- Vennesland, R. G. and R. W. Butler (2020). Great Blue Heron (Ardea herodias), version 1.0. In Birds of the World (A. F. Poole, Editor). Cornell Lab of Ornithology, Ithaca, NY, USA. https://doi.org/10.2173/bow.grbher3.01
Recommended Citation
- BirdForum Opus contributors. (2025) Great Blue Heron. In: BirdForum, the forum for wild birds and birding. Retrieved 15 January 2025 from https://www.birdforum.net/opus/Great_Blue_Heron
External Links
GSearch checked for 2020 platform.1
