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.

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.

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

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.

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.

Claudio Contreras / American white pelican (Pelecanus erythrorhynchos) flock in flight at dusk, Cienega de Santa Clara, Colorado River, Sonora, Mexico.

Claudio Contreras / American white pelican (Pelecanus erythrorhynchos) flock in flight at dusk, Cienega de Santa Clara, Colorado River, Sonora, Mexico.

Claudio Contreras / American white pelican (Pelecanus erythrorhynchos) flock in flight at dusk, Cienega de Santa Clara, Colorado River, Sonora, Mexico.

Claudio Contreras / American white pelican (Pelecanus erythrorhynchos) in flight against blue sky, Cienega de Santa Clara, Sonora, Mexico.

Claudio Contreras / American white pelican (Pelecanus erythrorhynchos) flock taking flight, Cienega de Santa Clara, Colorado River, Sonora, Mexico.

Claudio Contreras / American white pelican (Pelecanus erythrorhynchos) flock taking flight, Cienega de Santa Clara, Colorado River, Sonora, Mexico.

Claudio Contreras / American white pelican (Pelecanus erythrorhynchos) flock taking flight from river with mountains in background, Cienega de Santa Clara, Colorado River, Sonora, Mexico.

Claudio Contreras / American white pelican (Pelecanus erythrorhynchos) flock roosting at dawn along water's edge with Great egrets (Ardea alba) taking flight from reedbeds, Cienega de Santa Clara, Colorado River, So...

Claudio Contreras / American white pelican (Pelecanus erythrorhynchos) in flight against blue sky, Cienega de Santa Clara, Colorado River, Sonora, Mexico.

Claudio Contreras / Group of American white pelicans (Pelecanus erythrorhynchos) on water close to reedbeds at dawn, Cienega de Santa Clara, Colorado River, Sonora, Mexico.

Roland Seitre / American white pelican (Pelecanus erythrorhynchos) juveniles in creche with adults behind, USA.

Roland Seitre / American white pelican (Pelecanus erythrorhynchos) juveniles, USA.

Roland Seitre / American white pelican (Pelecanus erythrorhynchos) juveniles, USA.

Roland Seitre / American white pelican (Pelecanus erythrorhynchos) flock of ten swimming, Dakota, USA.

Roland Seitre / American white pelican (Pelecanus erythrorhynchos), Dakota, USA.

Jack Dykinga / American white pelican (Pelecanus erythrorhynchos) swallowing a catch of fish, Gilbert Riparian Preserve, Arizona, USA.

Jack Dykinga / American white pelican (Pelecanus erythrorhynchos) taking flight from lake, Gilbert Riparian Preserve, Arizona, USA.

Jack Dykinga / American white pelican (Pelecanus erythrorhynchos) landing on lake. Gilbert Riparian Preserve, Arizona, USA.

Jack Dykinga / Four American white pelican (Pelecanus erythrorhynchos) standing in shallow water, preening, Gilbert Riparian Preserve, Arizona, USA.

Jack Dykinga / American white pelican (Pelecanus erythrorhynchos) standing in shallow water, Gilbert Riparian Preserve, Arizona, USA.

Jack Dykinga / American white pelican (Pelecanus erythrorhynchos) preening and scratching in morning light. Gilbert Riparian Preserve, Arizona, USA.

Jack Dykinga / American white pelican (Pelecanus erythrorhynchos) preening wing feathers in morning light. Gilbert Riparian Preserve, Arizona, USA.

Jack Dykinga / American white pelican (Pelecanus erythrorhynchos) flying in morning light. Gilbert Riparian Preserve, Arizona, USA.

John Chan / American white pelican (Pelecanus erythrorhynchos) foraging in a tidal basin at sunset, Bolsa Chica Ecological Reserve, Southern California, USA, December.

John Chan / Two American white pelicans (Pelecanus erythrorhynchos) foraging in a tidal basin at sunset, Bolsa Chica Ecological Reserve, Southern California, USA, December.

John Chan / Group of American white pelicans (Pelecanus erythrorhynchos) resting and preening at their day roost, while a flock of Western sandpipers (Calidris mauri) take flight in the background, Bolsa Chica Ec...

John Chan / Group of American white pelicans (Pelecanus erythrorhynchos) foraging together while a Great blue heron (Ardea herodias) watches but keeps its distance, Bolsa Chica Ecological Reserve, Southern Califo...

John Chan / American avocets (Recurvirostra americana) and American white pelicans (Pelecanus erythrorhynchos) foraging in a tidal basin at sunset, Bolsa Chica Ecological Reserve, Southern California, USA, Octobe...

John Chan / American white pelicans (Pelecanus erythrorhynchos) foraging cooperatively to herd and capture prey. A Brown pelican (Pelecanus occidentalis) dives in the background, Bolsa Chica Ecological Reserve, S...

John Chan / American white pelicans (Pelecanus erythrorhynchos) foraging cooperatively to herd and capture prey, Bolsa Chica Ecological Reserve, Southern California, USA, October.

John Chan / American white pelicans (Pelecanus erythrorhynchos) foraging cooperatively to herd and capture prey, Bolsa Chica Ecological Reserve, Southern California, USA, October.

John Chan / American white pelicans (Pelecanus erythrorhynchos) foraging in tidal basin at sunset, Bolsa Chica Ecological Reserve, Southern California, USA, September.

Jack Dykinga / American white pelicans (Pelecanus erythrorhynchos) actively fishing. Riparian Preserve, Gilbert, Arizona, USA. November.

Jack Dykinga / American white pelicans (Pelecanus erythrorhynchos) preening, wintering at Riparian Preserve, Gilbert, Arizona, USA. November.

Jack Dykinga / American white pelican (Pelecanus erythrorhynchos) taking off, Riparian Preserve, Gilbert, Arizona, USA. November.

Jack Dykinga / American white pelicans (Pelecanus erythrorhynchos) group preening, wintering in the Riparian Preserve, Gilbert, Arizona, USA. November.

Jack Dykinga / Two American white pelicans (Pelecanus erythrorhynchos) flying in formation, Riparian Preserve, Gilbert, Arizona, USA. November.

Jack Dykinga / American white pelicans (Pelecanus erythrorhynchos) wintering, engaging in mass preening, with a Roseate spoonbill (Platalea ajaja) and American avocets (Recurvirostra americana), Riparian Preserve, G...

John Chan / Group of American white pelicans (Pelecanus erythrorhynchos) roosting on a mud flat, Royal terns (Thalasseus maximus) in foreground, Bolsa Chica Ecological Reserve, Southern California, USA, March.

John Chan / American white pelicans (Pelecanus erythrorhynchos) feeding, Bolsa Chica Ecological Reserve, Southern California, USA, December.

John Chan / American white pelicans (Pelecanus erythrorhynchos) engaging in cooperative foraging, Bolsa Chica Ecological Reserve, Southern California, USA, November.

John Chan / Group of American white pelicans (Pelecanus erythrorhynchos) preening and stretching while roosting on a tidal flat, Bolsa Chica Ecological Reserve, Southern California, USA.

John Chan / Group of American white pelicans (Pelecanus erythrorhynchos) preening and jostling for space while roosting on a tidal flat, Bolsa Chica Ecological Reserve, Southern California, USA.

John Chan / Mixed group of American white pelicans (Pelecanus erythrorhynchos) and Brown pelicans (Pelecanus occidentalis) preening on a tidal flat, with mating Bat rays (Myliobatis californica) swimming behind t...

John Chan / Mixed group of American white pelicans (Pelecanus erythrorhynchos) and Brown pelicans (Pelecanus occidentalis) preening whilst roosting on a tidal flat, Bolsa Chica Ecological Reserve, Southern Califo...

John Chan / American white pelicans (Pelecanus erythrorhynchos) competing for a roosting position on a boom, Bolsa Chica Ecological Reserve, Southern California, USA, August.

John Chan / American white pelicans (Pelecanus erythrorhynchos) preening, perched on a boom, Bolsa Chica Ecological Reserve, Southern California, USA, August.

Claudio Contreras / American White Pelican (Pelecanus erythrorhynchos) taking off, Ria Celestun Biosphere Reserve, Yucatan Peninsula, Mexico, January

Claudio Contreras / American White Pelican (Pelecanus erythrorhynchos) taking off, Ria Celestun Biosphere Reserve, Yucatan Peninsula, Mexico, January

John Chan / American white pelicans (Pelecanus erythrorhynchos) competing for roosting spots on a floating boom, Southern California, USA, July.

John Chan / American white pelicans (Pelecanus erythrorhynchos) competing with a Great blue heron (Ardea herodias) for roosting spots on a floating boom, Southern California, USA, July.

John Chan / American white pelicans (Pelecanus erythrorhynchos) competing for roosting spots on a floating boom, Southern California, USA, July.

John Chan / Flock of American white pelicans (Pelecanus erythrorhynchos) roosting, with a Black skimmer (Rynchops niger) feeding nearby, Southern California, USA, July.

John Chan / Flock of American white pelicans (Pelecanus erythrorhynchos) roosting, with a Black skimmer (Rynchops niger) feeding nearby, Southern California, USA, July.

John Chan / American white pelicans (Pelecanus erythrorhynchos) roosting and preening, Southern California, USA, July.