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Great Blue Heron

From Opus

Mature adultPhoto © by David RoachWakodahatchee, Florida, November 2018
Mature adult
Photo © by David Roach
Wakodahatchee, Florida, November 2018
Ardea herodias

Contents

[edit] Identification

A first year breeding birdPhoto © by David RoachWakodahatchee, Florida, November 2018
A first year breeding bird
Photo © by David Roach
Wakodahatchee, Florida, 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

[edit] "Great White" Heron

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.

[edit] Similar species

Subspecies occidentalis Photo © by dacolPaynes Prairie Preserve, Gainesville, Florida, May 2013
Subspecies occidentalis
Photo © by dacol
Paynes Prairie Preserve, Gainesville, Florida, May 2013

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
  • 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.

[edit] Distribution

JuvenilePhoto © by GrobertsonHenderson Bird Preserve, Las Vegas, March 2017
Juvenile
Photo © by Grobertson
Henderson Bird Preserve, Las Vegas, March 2017

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.

[edit] Taxonomy

[edit] Subspecies

Five subspecies are recognized[1]:

  • A.h. fannini:
  • A.h. herodias:
  • A.h. wardi:
  • A.h. occidentalis:
  • A.h. cognata:

[edit] Habitat

Photo © by ZackiedawgWakodahatchee Wetlands, Florida, USA, April 2010
Photo © by Zackiedawg
Wakodahatchee Wetlands, Florida, USA, April 2010

Margins of lakes and slow-flowing rivers, swamps and marshes, frequently on sea-coasts, in estuaries and mangroves.

[edit] Behaviour

Usually tucks its head into an S-shape when it is resting and flying.

[edit] Diet

Their main diet consists of fish.

[edit] References

  1. Clements, J. F., T. S. Schulenberg, M. J. Iliff, D. Roberson, T. A. Fredericks, B. L. Sullivan, and C. L. Wood. 2018. The eBird/Clements checklist of birds of the world: v2018. Downloaded from http://www.birds.cornell.edu/clementschecklist/download/
  2. Handbook of the Birds of the World Alive (retrieved July 2014)
  3. Thread in the id forum discussing the "Great White" form
  4. BF Member observations

[edit] External Links


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