Adult Brown Pelicans are gray-brown birds with yellow heads and white necks.
In breeding plumage, the back and sides of the neck turn a rich, dark reddish-brown.
Immatures have a gray-brown head and neck with a pale whitish belly and breast.

A juvenile Brown Pelican together with Double-crested Cormorants.

Ambergris Caye, Belize, 14 March 2009

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