Great Blue Heron

Ardea herodias
A Great Blue Heron specimen on display in the exhibit "Birds of D.C."

At over a metre and half in height, the great blue heron is the largest heron in North America and one of the continent's most recognisable wading birds (2) (3). There are two main colour morphs of this statuesque species: a dark form that is mostly blue-grey, with chestnut thighs, and a white cap over a black eye stripe that merges into long, black plumes; and a light form which is all white. The neck, legs and wings are characteristically long, the tail is short, and the yellowish bill is thick, elongate and tapered. In flight, it coils its neck back into a distinctive s-shape, extends its legs back along its body axis, and beats its wings with steady, powerful strokes (2) (3) (4). Although the sexes are similar in appearance, the female is normally around ten percent smaller than the male, while juveniles are duller and lack the long plumes of the adults (4) (5). Considerable uncertainty surrounds the separation of subspecies of the great blue heron, with between two and seven recognised for North America alone (4). However, five main subspecies, that differ in size and plumage and occupy different parts of the species overall range, are commonly referred to: Ardea herodias herodias, A. h. fannini, A. h. wardii, A. h. occidentalis (the white form), and A. h. cognata (2) (4).

DC Information

Common permanent resident, more abundant in summer than in winter. Nests from mid-March to mid-July. Found wading in streams, in fresh and salt marshes, and along barrier beaches. Sexes are similar.

Specimen Information

 
Date: 7/18/1891
Collected By: TJ Herald
Locality:  Hunson Hill, MD
Sex: Female
Catalog ID: 121165
 

Distribution Map

distribution map for this species

Bird Vocalizations

Ardea herodias

Ardea herodias

Sound from xeno-canto. XC16894 Ardea herodias (Great Blue Heron)

Images