Tim Fitzharris / American White Pelican (Pelecanus erythrorhynchos), North America

LYNN M. STONE / American white pelican wintering in Florida USA {Pelecanus erythrorhynchos}

Lynn M Stone / American white pelican, beak open {Pelecanus erythrorhynchos} USA.

Rolf Nussbaumer / American white pelican landing on water {Pelecanus erythrorhynchos} Texas, USA

Tom Vezo / American White Pelican (Pelecanus erythrorhynchos) landing in water, Everglades National Park, Florida

Jim Brandenburg / American White Pelican (Pelecanus erythrorhynchos) stretching its wings on a misty lake, North America

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 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.

Marie Read / Avian feeding frenzy with a flock of White Pelicans (Pelecanus erythrorhynchos) swimming along a channel chasing school of fish. A mixed flock of long-legged waders, including Great Egrets (Ardea alba...

Marie Read / White pelicans (Pelecanus erythrorhynchos) at Bear River Migratory Bird Refuge with an approaching storm in May, Utah, USA, May.

Ashley Cooper / American white pelicans (Pelecanus erythrorhynchos) at Lake Success near Porterville, Bakersfield which is at 7% capacity during severe drought, California, USA, October 2014.

Lynn M. Stone / American white pelican (Pelecanus erythrorhynchos) swimming along lakeshore, Lakeland, Florida, USA. December.

Lynn M. Stone / American white pelican (Pelecanus erythrorhynchos) swimming along lakeshore, Lakeland, Florida, USA. December.

Lynn M. Stone / American white pelican (Pelecanus erythrorhynchos) at base of Bald Cypress trees along lakeshore, Lakeland, Florida, USA.

Lynn M. Stone / American white pelicans (Pelecanus erythrorhynchos) on northward mid-April migration from south Florida, Pinellas County, Florida, USA. April. Non-ex.

Lynn M. Stone / American white pelicans (Pelecanus erythrorhynchos) on northward mid-April migration from south Florida, Florida, USA, April.

Connor Stefanison / American white pelican (Pelecanus erythrorhynchos) flying over marsh near breeding ground, Stum Lake, British Columbia, Canada. June.

Steve Gettle / American White Pelican (Pelecanus erythrorhynchos) flying, North Dakota

Roger Powell / American white pelicans (Pelecanus erythrorhynchos) large flock group feeding by encircling fish trapped by the falling tide, Cedar Key, Levy County, Florida, USA, April

Roger Powell / American white pelicans (Pelecanus erythrorhynchos) large flock group feeding by encircling fish trapped by the falling tide, Cedar Key, Levy County, Florida, USA, April

Jim Brandenburg / American White Pelican (Pelecanus erythrorhynchos) group preening, Minnesota

George Sanker / American White Pelican (Pelecanus erythrorhynchos) group preening whilst Snowy Egret (Egretta thula) takes off, Ding Darling National Wildlife Refuge, Sanibel Island, Florida, USA.

Gerrit Vyn / Flock of American white pelicans (Pelecanus erythrorhynchos) foraging in a wetland during fall migration. Malheur County, Oregon, USA. September.

Ernie Janes / Brown pelican (Pelecanus occidentalis) landing on Cormorant (Phalacrocorax auritus) Gulf Coast, Florida, USA, March

Ernie Janes / Brown pelican (Pelecanus occidentalis) landing on Cormorant (Phalacrocorax auritus) Gulf Coast, Florida, USA, March.

Gerrit Vyn / Brown pelicans (Pelecanus occidentalis) and Great egrets (Ardea alba) roosting on mangroves in a Barataria Bay nesting colony. This colony was heavily oiled by the BP Deepwater Horizon oil leak. Plaq...

Roland Seitre / American White Pelican (Pelecanus erythrorhynchos) group flying, Canada

Claudio Contreras / American white pelican (Pelecanus erythrorhynchos) group of four on water, Xochimilco wetlands, Mexico City, March

Claudio Contreras / American white pelican (Pelecanus erythrorhynchos) group around small rocky island, Xochimilco wetlands, Mexico City, March

Claudio Contreras / American white pelican (Pelecanus erythrorhynchos) group swimming together. Xochimilco wetlands, Mexico City, Mexico. March

Claudio Contreras / American white pelican (Pelecanus erythrorhynchos) group of five flying, Xochimilco wetlands, Mexico City, February

Claudio Contreras / American white pelican (Pelecanus erythrorhynchos) group of four, Xochimilco wetlands, Mexico City, March

Claudio Contreras / American white pelican (Pelecanus erythrorhynchos) coming into landing, Xochimilco wetlands, Mexico City, March

Stephen Dalton / White pelicans (Pelecanus erythrorhynchos) Florida, USA, February.

Shattil & Rozinski / American white pelican (Pelecanus erythrorhynchos) in breeding condition, with bill horn growth, Cherry Creek State Park, Denver, Colorado, USA, July.

Nick Saunders / American White Pelican (Pelecanus erythrorhynchos), Saskatoon, Saskatchewan, Canada

Alan Murphy / American White Pelican (Pelecanus erythrorhynchos) flock, Texas

Jan Wegener / American White Pelican (Pelecanus erythrorhynchos), Florida

LYNN M. STONE / American white pelican (Pelecanus erythrorhynchos) landing, Sarasota, Florida, USA, January

David Pike / American White Pelican (Pelecanus erythrorhynchos). Yellowstone River, Yellowstone National Park, Wyoming, USA, July.

David Pike / American White Pelican (Pelecanus erythrorhynchos). Yellowstone River, Yellowstone National Park, Wyoming, USA.

Juan Carlos Munoz / American White Pelican (Pelecanus erythrorhynchos) by water. Everglades National Park, Florida, USA, February.

Juan Carlos Munoz / American White Pelican (Pelecanus erythrohycnchos) flock. Everglades National Park, Florida, USA, February.

LYNN M. STONE / American White Pelican (Pelecanus erythrorynchos) in breeding plumage, Mississippi River, near East Moline, Illinois, USA, May.

LYNN M. STONE / American White Pelican (Pelecanus erythrorynchos) in breeding plumage landing on the Mississippi River, near East Moline, Illinois, USA, May.

LYNN M. STONE / Wintering American White Pelicans (Pelecanus erythrorhyncos) in non-breeding plumage, feeding in shallow lake by using their gular pouches to net fish. Sarasota, Florida, USA, April.

LYNN M. STONE / Roseate Spoonbill (Platalea ajaja), adult in breeding plumage, foraging in shallow freshwater lake with an American White Pelican (Pelecanus erythrorhynchos). Sarasota County, Florida, USA, March.

LYNN M. STONE / American White Pelican (Pelecanus erythrorhynchos) in winter plumage on water. Manatee County, Florida, USA, January.

LYNN M. STONE / American White Pelicans (Pelecanus erythrorhynchos) in winter plumage on water. Manatee County, Florida, USA, January.

LYNN M. STONE / American White Pelican (Pelecanus erythrorynchos) in breeding plumage landing on Mississippi River, near East Moline, Illinois, USA, May.

LYNN M. STONE / American White Pelican (Pelecanus erythrorynchos) in breeding plumage; note characteristic 'horn', which will drop off later in the breeding season, on upper mandible. Mississippi River, near East Mol...

LYNN M. STONE / American White Pelican (Pelecanus erythrorhynchos) wintering on tidal bay in dawn light. Manatee County, Florida, USA, December.

LYNN M. STONE / American White Pelicans (Pelecanus erythrorhynchos) wintering on tidal bay; with Great Egret standing to right of forefront. Manatee County, Florida, USA, December.

Gerrit Vyn / American White pelicans (Pelecanus erythrorhynchos) flock cooperative feeding in a shallow marsh during fall migration, Malheur County, Oregon, USA September

Hanne & Jens Eriksen / American white pelican (Pelecanus erythrorhynchos) with open bill, Texas, USA, January

LYNN M. STONE / American white pelican (Pelecanus erythrorhynchos) taking off from the Mississippi River, northern Illinois, USA, June

LYNN M. STONE / Pair of American white pelicans (Pelecanus erythrorhynchos) landing into the wind on ruffled Mississippi River, both birds in post-breeding plumage, Northern Illinois, USA, June

Steve Gettle / American White Pelican (Pelecanus erythrorhynchos) flock preening, Gasparilla Sound, Florida

Steve Gettle / American White Pelican (Pelecanus erythrorhynchos) flock, Gasparilla Sound, Florida

Matthias Breiter / American White Pelican (Pelecanus erythrorhynchos) flying, Lockport, Manitoba, Canada

Matthias Breiter / American White Pelican (Pelecanus erythrorhynchos) flying, Lockport, Manitoba, Canada

LYNN M. STONE / American White pelican in flight (Pelecanus erythrorhynchos) in fading breeding plumage (characteristic horn on upper mandible has sloughed off), Mississippi River, northern Illinois, USA, May

LYNN M. STONE / American White pelican (Pelecanus erythrorhynchos), adult in breeding plumage (note hard knob on upper mandible, a characteristic feature of white pelicans only in the courtship and early breeding sea...

LYNN M. STONE / American White pelican (Pelecanus erythrorhynchos), adult in breeding plumage (note hard knob on upper mandible, a characteristic feature of white pelicans only in the courtship and early breeding sea...

LYNN M. STONE / American White pelican (Pelecanus erythrorhynchos) at onset of breeding plumage, Lakeland, Florida, USA, March

LYNN M. STONE / American White pelican (Pelecanus erythrorhynchos) in flight, in breeding plumage (note characteristic horn on upper mandible, bright orange bill, and yellow pouch), Mississippi River, northern Illino...

LYNN M. STONE / American White pelican (Pelecanus erythrorhynchos), adult in breeding plumage (note hard knob on upper mandible, a characteristic feature of white pelicans only in the courtship and early breeding sea...

George Sanker / American White Pelican (Pelecanus erythrorhynchos) resting on Snake River. Grand Teton National Park, Wyoming, USA, June.

Diane McAllister / American white pelican (Pelecanus erythrorhynchos) in breeding plumage showing horny plate on upper mandible. It is displaying with wings spread and standing on a rock in the water. Colorado, USA, May

Jim Brandenburg / American White Pelican (Pelecanus erythrorhynchos) flock, Split Rock Creek State Park, Minnesota

Steven Kazlowski / American White Pelican (Pelecanus erythrorhynchos) swimming in the Salton Sea in winter, Colorado Desert, California

Yva Momatiuk & John Eastcott / American White Pelican (Pelecanus erythrorhynchos) and Brown Pelican (Pelecanus occidentalis), North America

LYNN M. STONE / Two White Pelicans (Pelecanus erythrorhynchos) wading in shallow water, during migratory stop en route from Gulf of Mexico to Montana and/or Alberta, Canada; Shabbona, Illinois, USA.

Gerrit Vyn / Flock of American White Pelicans (Pelecanus erythrorhynchos) taking flight. Texas, USA, March.

Claudio Contreras / Head and eyes of American white pelican (Pelecanus erythrorhynchos) captive, Yucatan Peninsula, Mexico, March

Claudio Contreras / Close up of feathers of American white pelican (Pelecanus erythrorhynchos) captive, Yucatan Peninsula, Mexico, March

Sebastian Kennerknecht / American White Pelican (Pelecanus erythrorhynchos) flock flying, using thermals, Prairie du Chien, Wisconsin

Tim Laman / American White Pelican (Pelecanus erythrorhynchos) feeding in Mrazek Pond, Everglades National Park. Florida, USA.

Jim Brandenburg / American White Pelican (Pelecanus erythrorhynchos) feeding young, North Dakota

Adrian Davies / Two American white pelicans {Pelecanus erythrorhynchos} in flight, Ding Darling Nature Reserve, Sanibel Island, Florida, USA

Donald M. Jones / American White Pelican (Pelecanus erythrorhynchos) in Yellowstone River, Yellowstone National Park, Wyoming

Donald M. Jones / American White Pelican (Pelecanus erythrorhynchos) in Yellowstone River, Yellowstone National Park, Wyoming

Tim Laman / American white pelicans (Pelecanus erythrorhynchos), Marbled godwits (Limosa fedoa), and Willets (Catoptrophorus semipalmatus). Moss Landing, California.

Shattil & Rozinski / American white pelican {Pelecanus erythrorhynchos} flock feeding on water, Colorado, USA

Shattil & Rozinski / American white pelican {Pelecanus erythrorhynchos} stretching wings, Rocky Mt Arsenal NWR, Colorado, USA

Tim Fitzharris / American White Pelican (Pelecanus erythrorhynchos) group preening, North America

Tom Vezo / American White Pelican (Pelecanus erythrorhynchos) group flying, Salton Sea National Wildlife Refuge, California

John Cancalosi / American white pelican {Pelecanus erythrorhynchos} landing on water, USA

John Cancalosi / American white pelican {Pelecanus erythrorhynchos} landing on water, USA

John Cancalosi / American white pelican {Pelecanus erythrorhynchos} landing on water, USA

John Cancalosi / American white pelican {Pelecanus erythrorhynchos} landing on water, USA

Shattil & Rozinski / American white pelicans {Pelecanus erythrorhynchos} taking off from water, Denver, Colorado, USA