Norbert Wu / Big-mouth Gulper (Eurypharynx pelecanoides) deep sea species with hinged mouth swings wide open to accommodate large prey, San Diego, California

Tim Fitzharris / Brown Pelican (Pelecanus occidentalis) flock taking flight from a rocky shoreline, Isla Isabel, Nayarit, Mexico

LYNN M. STONE / American white pelicans, Florida USA

LYNN M. STONE / American white & Brown pelican P. occidentalis}, Florida, USA

LYNN M. STONE / American white pelican on water, Florida, USA

John Downer / Brown pelicans and fishing trawler. San Lucas, Mexico.

Juan Carlos Munoz / Brown pelican (Pelecanus occidentalis). La Jolla, San Diego, California, USA. February.

Juan Carlos Munoz / Brown pelican (Pelecanus occidentalis)in flight over coast. La Jolla, San Diego, California, USA. February.

John Chan / California brown pelicans (Pelecanus occidentalis) preening, with Double-crested cormorants (Phalacrocorax auritus) roosting nearby, Southern California, USA, June.

John Chan / Flock of California brown pelicans (Pelecanus occidentalis) and Double-crested cormorants (Phalacrocorax auritus) taking off, Southern California, USA, June.

John Chan / American white pelicans (Pelecanus erythrorhynchos) feeding at twilight, Southern California, USA.

John Chan / California brown pelicans (Pelecanus occidentalis californicus) stretching their gular pouches and preening, resting near to a flock of Elegant terns (Thalasseus elegans), Southern California, USA, Ma...