It is the largest North American heron and, among all extant herons, it is
surpassed only by the Goliath Heron and the White-bellied Heron. It has head-to-tail
length of 91–137 cm (36–54 in), a wingspan of 167–201 cm (66–79 in), a height
of 115–138 cm (45–54 in), and a weight of 2.1–3.6 kg (4.6–7.9 lb).[4][5][6] Notable features include slaty flight feathers,
red-brown thighs, and a paired red-brown and black stripe up the flanks; the
neck is rusty-gray, with black and white streaking down the front; the head is
paler, with a nearly white face, and a pair of black plumes running from just
above the eye to the back of the head. The feathers on the lower neck are long
and plume-like; it also has plumes on the lower back at the start of the
breeding season. The bill is dull yellowish, becoming orange briefly at the
start of the breeding season, and the lower legs gray, also becoming orangey at
the start of the breeding season. Immature birds are duller in color, with a
dull blackish-gray crown, and the flank pattern only weakly defined; they have
no plumes, and the bill is dull gray-yellow.[3][7][8] Among standard measurements, the wing
chord is 43–48 cm (17–19 in), the tail is 15.2–19 cm (6.0–7.5 in), the culmen is 13.1–15.2 cm (5.2–6.0 in) and the
tarsus is 15.7–21 cm (6.2–8.3 in).[9]
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