John Chan / American avocet (Recurvirostra americana) foraging in a tidal basin, Bolsa Chica Ecological Reserve, Southern California, USA, December.

John Chan / Two American avocets (Recurvirostra americana) in a tidal basin, one becomes alert to an aerial threat, Bolsa Chica Ecological Reserve, Southern California, USA, December.

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 / American avocets (Recurvirostra americana) foraging in a tidal basin at sunset, Bolsa Chica Ecological Reserve, Southern California, USA, October.

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 avocets (Recurvirostra americana) foraging in a tidal basin, Bolsa Chica Ecological Reserve, Southern California, USA, October.

John Chan / American avocets (Recurvirostra americana) foraging in a tidal basin, Bolsa Chica Ecological Reserve, Southern California, USA, October.

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.

John Chan / American avocet (Recurvirostra americana) feeding and preening, Bolsa Chica Ecological Reserve, Southern California, USA, January.

John Chan / Four American avocets (Recurvirostra americana) briefly engaging in teritorial dispute, Bolsa Chica Ecological Reserve, Southern California, USA, January.

Michel Poinsignon / Buzzard (Buteo buteo) landing, Lorraine, France, January

Michel Poinsignon / Buzzard (Buteo buteo) landing in rain, Lorraine, France, March

Michel Poinsignon / Buzzard (Buteo buteo) landing on branch, winter, Lorraine, France, February

Michel Poinsignon / Buzzard (Buteo buteo) landing on branch and calling, Lorraine, France, January

Michel Poinsignon / Buzzard (Buteo buteo) landing, Lorraine, France, February

Michel Poinsignon / Buzzard (Buteo buteo) landing and calling, Lorraine, France, January

Michel Poinsignon / Buzzard (Buteo buteo) landing on branch in winter, Lorraine, France, February

Michel Poinsignon / Buzzard (Buteo buteo) perched on a branch in winter, Lorraine, France, December

Michel Poinsignon / Buzzard (Buteo buteo) perched on a branch in winter, Lorraine, France, January

Michel Poinsignon / Magpie (Pica pica) pulling the tail of Buzzard (Buteo buteo) Lorraine, France, February

Michel Poinsignon / Blue tit (Parus caeruleus) perched on Hazel branch with catkins, Lorraine, France, February

Michel Poinsignon / Blue tit (Parus caeruleus) bathing, Lorraine, France, March

Michel Poinsignon / Blackbird (Turdus merula) male at water's edge in rain, Lorraine, France, December

Michel Poinsignon / Blackbird (Turdus merula) female drinking, Lorraine, France, January

Michel Poinsignon / Bearded tit (Panurus biarmicus) male feeding on Phragmites seed head, Remerschen, Luxemburg, March

Michel Poinsignon / Marsh tit (Parus palustris) perched on branch, Lorraine, France, March

Michel Poinsignon / Magpie (Pica pica) perched on branch in snow, Lorraine, France, January

Michel Poinsignon / Magpies (Pica pica) fighting on branch in winter, Lorraine, France, January

Michel Poinsignon / Jays (Garrullus glandarius) fighting for food in winter in snow, Lorraine, France, February

Michel Poinsignon / Jays (Garrullus glandarius) fighting for food in snow, Lorraine, France, February

Michel Poinsignon / Jay (Garrullus glandarius) perched on branch in snow, Lorraine, France, March

Michel Poinsignon / Jay (Garrulus glandarius) with acorn in beak, Lorraine, France, December

Michel Poinsignon / Jay (Garrulus glandarius) with acorn, winter, Lorraine, France, November

Michel Poinsignon / Hawfinch (Coccothraustes coccothraustes) perched on branch in snow, Lorraine, France, March

Michel Poinsignon / Hawfinch (Coccothraustes coccothraustes) perched on branch, Lorraine, France, February

Michel Poinsignon / Greenfinches (Carduelis chloris) fighting on branch in the snow, Lorraine, France, January

Michel Poinsignon / Greenfinch (Carduelis chloris) perched on branch in rain, Lorraine, France, January

Michel Poinsignon / Greenfinch (Carduelis chloris) perched on branch, Lorraine, France, February

Michel Poinsignon / Chaffinch (Fringilla coelebs) perched on branch in winter, Lorraine, France, January

Tui De Roy / Galapagos land iguana (Conolophus subcristatus) with Galapagos mockingbird (Mimus parvulus) Fernandina Volcano, Galapagos .

Eduardo Blanco / Eurasian tree sparrow (Passer montanus) with insect prey to feed its offspring, Northern Spain. May.

Eduardo Blanco / Eurasian tree sparrow (Passer montanus) with insect prey to feed its offspring, Northern Spain. May.

Eduardo Blanco / Eurasian tree sparrow (Passer montanus) with insect prey to feed its offspring, Northern Spain. May.

Eduardo Blanco / Eurasian tree sparrow (Passer montanus) with insect prey to feed its offspring, Northern Spain. May.

Eduardo Blanco / Eurasian tree sparrow (Passer montanus) with insect prey to feed its offspring, Northern Spain. May.

Eduardo Blanco / Eurasian tree sparrow (Passer montanus) with insect prey to feed its offspring, Northern Spain. May.

Eduardo Blanco / Eurasian tree sparrow (Passer montanus) young chick, eyes open with feathers beginning to emerge, Northern Spain. June. Growth and development sequence 2 of 4.

Eduardo Blanco / Eurasian tree sparrow (Passer montanus), chick with wing feathers, Northern Spain. June. Growth and development sequence 3 of 4.

Eduardo Blanco / Eurasian tree sparrow (Passer montanus), newly hatched, blind, featherless chick, Northern Spain. June. Growth and development sequence 1 of 4.

Eduardo Blanco / Eurasian tree sparrow (Passer montanus) fledgling, Northern Spain. June. Growth and development sequence 4 of 4.

Nick Upton / Wild Parsnip (Pastinaca sativa) with yellow flowers and Wild carrot (Daucus carota) with white flowers growing on chalk cliff top grassland, Old Harry's Rocks, Studland, Dorset, UK, August.

Nick Upton / Wild Parsnip (Pastinaca sativa) with yellow flowers and Wild carrot (Daucus carota) with white flowers growing on chalk cliff top grassland, Old Harry's Rocks, Studland, Dorset, UK, August.

Nick Upton / Wild Parsnip (Pastinaca sativa) with yellow flowers and Wild carrot (Daucus carota) with white flowers growing on chalk cliff top grassland, Studland, Dorset, UK, August.

Nick Upton / Wild Parsnip (Pastinaca sativa) with yellow flowers and Wild carrot (Daucus carota) with white flowers growing on chalk cliff top grassland, Studland, Dorset, UK, August.

Jack Dykinga / American coot (Fulica americana) swimming across pond with reflection of yellow Ash leaves in autumn. Gilbert Riparian Preserve, Gilbert, Arizona, USA, December.

Jack Dykinga / American coot (Fulica americana) swimming across pond with reflection of yellow Ash leaves in autumn. Gilbert Riparian Preserve, Gilbert, Arizona, USA, December.

Jack Dykinga / Sandhill cranes (Grus canadensis) wading in water at sunrise. Bosque del Apache National Wildlife Refuge, New Mexico.

Jack Dykinga / Sandhill cranes (Grus canadensis) flock with territorial fighting. Bosque del Apache National Wildlife Refuge, New Mexico, USA. December.

Jack Dykinga / Sandhill cranes (Grus canadensis) flock with territorial fighting. Bosque del Apache National Wildlife Refuge, New Mexico, USA. December.

Jack Dykinga / Sandhill cranes (Grus canadensis) flock with territorial fighting. Bosque del Apache National Wildlife Refuge, New Mexico, USA. December.

Jack Dykinga / Sandhill cranes (Grus canadensis) flock with territorial fighting. Bosque del Apache National Wildlife Refuge, New Mexico, USA. December.

Jack Dykinga / Sandhill cranes (Grus canadensis) flock with territorial fighting. Bosque del Apache National Wildlife Refuge, New Mexico, USA. December.

Jack Dykinga / Sandhill crane (Grus canadensis) in flight, about to land, Bosque del Apache National Wildlife Refuge, New Mexico, USA. December.

Jack Dykinga / Northern pintail ducks (Anas acuta) males in territorial fight, Bosque del Apache, National Wildlife Refuge, New Mexico, USA. December.

Jack Dykinga / Northern pintail ducks (Anas acuta) males in territorial fight, Bosque del Apache, National Wildlife Refuge, New Mexico, USA. December.

Jack Dykinga / Sandhill cranes (Grus canadensis) group of six, silhouetted, calling in icy pond waters. Bosque del Apache, National Wildlife Refuge, New Mexico, USA. December.

Jack Dykinga / Sandhill cranes (Grus canadensis) flock flying in front of the moon at dawn, Whitewater Draw Wildlife Area, Southeastern Arizona, USA. December.

Jack Dykinga / Sandhill cranes (Grus canadensis) at sunrise with fog and ice. Bosque del Apache National Wildlife Refuge, New Mexico, USA. December.

Jack Dykinga / Sandhill cranes (Grus canadensis) taking off from icy water surface at dawn. Bosque del Apache National Wildlife Refuge, New Mexico, USA. December.

Jack Dykinga / Sandhill cranes (Grus canadensis) flying in front of moon at dawn. Whitewater Draw Wildlife Area, Southeastern Arizona, USA. December.

Jack Dykinga / Sandhill cranes (Grus canadensis) flock flying, with full winter moon at dawn. Whitewater Draw Wildlife Area, Southeastern Arizona, USA. December.

Jack Dykinga / Sandhill cranes (Grus canadensis) courtship rituals. Male on the left. Whitewater Draw Wildlife Area, Southeastern Arizona, USA. December.

Jack Dykinga / Sandhill cranes (Grus canadensis) male displaying. Whitewater Draw Wildlife Area, Southeastern Arizona, USA. December.

Jack Dykinga / Snowy egret (Egretta thula) taking off from the Riparian Reserve pond, with autumn reflections of yellow ash tree on the water. Gilbert Riparian Preserve, Gilbert, Arizona, USA. December.

Jack Dykinga / Great egret (Ardea alba) with autumn reflections of yellow ash tree on the water. Gilbert Riparian Preserve, Gilbert, Arizona, USA. December.

Jack Dykinga / Snowy egret (Egretta thula) catching fish in Riparian Reserve pond, with autumn reflections of yellow ash tree on the water. Gilbert Riparian Preserve, Gilbert, Arizona, USA. December.

Jack Dykinga / Canada goose (Branta canadenesis) walking in pond with reflection of yellow Ash leaves in autumn. Gilbert Riparian Preserve, Gilbert, Arizona, USA, December.

Nick Garbutt / Pink footed geese (Anser brachyrhynchus) flock taking flight, near Udale Bay, Black Isle, Scotland, UK, October.

Nick Garbutt / Pink footed geese (Anser brachyrhynchus) flock taking flight, near Udale Bay, Black Isle, Scotland, UK, October.

Nick Garbutt / Eurasian treecreeper (Certhia familiaris) roosting in excavated hole in bark of introduced Giant sequoia (Sequoiadendron giganteum). Aigas Field Centre, near Inverness, Scotland, UK, October. Focus st...

Loic Poidevin / African sacred ibis ( Threskiornis aethiopicus) foraging in grass, Vendee, France, September.

Loic Poidevin / European robin (Erithacus rubecula) singing, Vendee, France, September

John Shaw / Bald cypress trees (Taxodium distichum) in early morning, and epiphytic Spanish moss (Tillandsia usneoides). Several osprey (Pandion haliaetus) and nests are in the frame. Blue Cypress Lake, Florida,...

John Shaw / Bald cypress tree (Taxodium distichum) draped with epiphytic Spanish moss (Tillandsia usneoides), with an osprey (Pandion haliaetus) sitting in nest in top of tree. Blue Cypress Lake, Florida, USA. Ap...

John Shaw / Purple gallinule (Porphyrio martinicus) and Giant bulrush (Schoenoplectis californicus). Wakodahatchee Wetlands, Florida, USA, April.

John Shaw / Purple gallinule (Porphyrio martinicus) and giant bulrush (Schoenoplectis californicus). Wakodahatchee Wetlands, Florida, USA, April.

John Shaw / Boat-tailed grackle (Quiscalus major). Wakodahatchee Wetlands, Florida, USA, April.

John Shaw / Wood stork (Mycteria americana) taking off, Wakodahatchee Wetlands, Florida, USA, April.

John Shaw / Purple gallinule (Porphyrio martinicus) reaches for Giant bulrush seeds (Schoenoplectis californicus). Wakodahatchee Wetlands, Florida, USA, April.

John Shaw / Boat-tailed grackle pair (Quiscalus major) in courtship display. Wakodahatchee Wetlands, Florida, USA, April.