Marie Read / Ruby-throated Hummingbird (Archilocus colubris), male flying in to feed from cardinal flowers (Lobelia cardinalis) New York, USA. August.

Melvin Grey / Purple-throated mountain gem (Lampornis calolaemus) adult female - about to feed from flower, Atlantic Rainforest, Costa Rica.

Tim Fitzharris / Ruby-throated Hummingbird (Archilochus colubris) females feeding on flower nectar, Texas

Tim Fitzharris / Ruby-throated Hummingbird (Archilochus colubris) female and Bumblebee (Bombus sp) flying, Arkansas

Kerstin Hinze / Dipper (Cinclus cinclus) foraging in a stream, Harz National Park, Saxony-Anhalt, Germany, March.

Graeme Guy/ BIA / Blue-throated Bee-eater (Merops viridis) pair, Penang, Malaysia

Philippe Clement / European dipper (Cinclus cinclus) perched on rock in stream and looking around, Luxembourg, April.

Philippe Clement / European dipper (Cinclus cinclus) perched on a rock at the base of a waterfall and bobbing, Luxembourg, April.

Agustin Esmoris / White-throated Hummingbird (Leucochloris albicollis) feeding on flower nectar, Argentina

Agustin Esmoris / White-throated Hummingbird (Leucochloris albicollis) feeding on flower nectar, Argentina

Agustin Esmoris / Black-throated Mango (Anthracothorax nigricollis) hummingbird feeding on flower nectar, Argentina

Bence Mate / White-throated Mountain Gem (Lampornis castaneoventris), Green-crowned Brilliant (Heliodoxa jacula) group of three with one in flight, Savegre, Costa Rica

Jussi Murtosaari / European Dipper (Cinclus cinclus) on ice next to stream, winter, Finland. February.

Espen Bergersen / Red throated diver (Gavia stellata) pair on water with reflection, Troms, Norway, June.

Melvin Grey / Purple-throated woodstar hummingbird (Calliphlox mitchellii) hummingbird male flying to garden flower, Mindo Loma, Ecuador

Markus Varesvuo / Dippers (Cinclus cinclus) fighting in snow, Kuusamo, Finland, March. Second Place in the Telephoto Lens Category of the Terre Sauvage Nature Images Awards competitiion 2015.

Danny Green / Black-throated diver (Gavia arctica), Finland, June.

Danny Green / Black-throated diver (Gavia arctica) displaying, Finland, June.

Danny Green / Black-throated diver (Gavia arctica) on near waters edge, Finland, June.

Donald M. Jones / Black-throated Sparrow (Amphispiza bilineata) calling from cactus, Arizona

Donald M. Jones / Black-throated Sparrow (Amphispiza bilineata) perching on cactus, Arizona

Markus Varesvuo / Black-throated diver (Gavia arctica) on water, Finland, May.

Markus Varesvuo / Black-throated diver (Gavia arctica) on water, Finland, May.

Graeme Guy / Blue-throated Bee-eater (Merops viridis) pair, Penang, Malaysia

Jim Brandenburg / Ruby-throated Hummingbird (Archilochus colubris) female flying, North America

Michael & Patricia Fogden / Magenta-throated Woodstar (Calliphlox bryantae) hummingbird male feeding on epiphytic Heath (Cavendishia complectens) nectar, rainforest, Costa Rica

Michael & Patricia Fogden / Purple-throated Mountain-gem (Lampornis calolaemus) hummingbird female feeding and pollinating flower of epiphytic Heath (Cavendishia melastomoides) cloud forest, Costa Rica

Michael & Patricia Fogden / Purple-throated Mountain-gem (Lampornis calolaemus) hummingbird female feeding at and pollinating epiphytic Orchid flowers (Elleanthus sp), Monteverde Cloud Forest Reserve, Costa Rica

Ann & Steve Toon / Pink-throated twinspot (Hypargos margaritatus), Zimanga private game reserve, KwaZulu-Natal, South Africa.

Staffan Widstrand / Wild Wonders of China / Black-throated sunbird (Aethopyga saturata) Tongbiguan nature reserve, Dehong, Yunnan, China

Staffan Widstrand / Wild Wonders of China / White-throated fantail (Rhipidura albicollis) Gaoligongshan Nature Reserve, Yunnan, China

Staffan Widstrand / Wild Wonders of China / Black-throated sunbird (Aethopyga saturata) female, Gaoligongshan, Yunnan, China

Staffan Widstrand / Wild Wonders of China / Black-throated sunbird (Aethopyga saturata) female, Gaoligongshan, Yunnan, China

Staffan Widstrand / Wild Wonders of China / Rufous-throated Partridge (Arborophila rufogularis) Gaoligongshan, Yunnan, China

Staffan Widstrand / Wild Wonders of China / Rufous-throated Partridge (Arborophila rufogularis) Gaoligongshan, Yunnan, China

Staffan Widstrand / Wild Wonders of China / Blue-throated barbet (Psilopogon asiaticus) Tongbiguan Nature Reserve, Dehong, Yunnan, China

Staffan Widstrand / Wild Wonders of China / Blue-throated barbet (Psilopogon asiaticus) Tongbiguan Nature Reserve, Dehong, Yunnan, China

Staffan Widstrand / Wild Wonders of China / White-throated bulbul (Alophoixus flaveolus) Tongbiguan Nature Reserve, Dehong, Yunnan, China

Staffan Widstrand / Wild Wonders of China / Grey-throated babbler (Stachyris nigriceps) Tongbiguan Nature Reserve, Dehong, Yunnan, China

Staffan Widstrand / Wild Wonders of China / White-throated bulbul (Alophoixus flaveolus) Tongbiguan Nature Reserve, Dehong, Yunnan, China

Staffan Widstrand / Wild Wonders of China / Wreathed hornbill (Rhyticeros undulatus) Tongbiguan Nature Reserve, Dehong, Yunnan, China

Staffan Widstrand / Wild Wonders of China / Wreathed hornbill (Rhyticeros undulatus) Tongbiguan Nature Reserve, Dehong, Yunnan, China

Staffan Widstrand / Wild Wonders of China / Wreathed hornbill (Rhyticeros undulatus) flying to tree, Tongbiguan Nature Reserve, Dehong, Yunnan, China

Staffan Widstrand / Wild Wonders of China / Wreathed hornbill (Rhyticeros undulatus) Tongbiguan Nature Reserve, Dehong, Yunnan, China

Staffan Widstrand / Wild Wonders of China / Black-throated sunbird (Aethopyga saturata) Tongbiguan nature reserve, Dehong, Yunnan, China

Dong Lei / Blue-throated barbet (Megalaima asiatica) roosting in tree stump at night. Simao, Pu'er Prefecture, Yunnan Province, China.

Dong Lei / Blue-throated barbet (Megalaima asiatica) roosting in tree stump at night. Simao, Pu'er Prefecture, Yunnan Province, China.

Dong Lei / Blue-throated barbet (Megalaima asiatica) at night roost in tree hole. Simao, Pu'er Prefecture, Yunnan Province, China.

Dong Lei / Blue-throated barbet (Megalaima asiatica) roosting in tree stump at night. Simao, Pu'er Prefecture, Yunnan Province, China.

Dong Lei / White-throated dipper (Cinclus cinclus) feeding at water's edge, tadpole in beak. Sanjiangyuan National Nature Reserve, Qinghai Province, Qinghai-Tibet Plateau. August.

Dong Lei / Verreaux's monal partridge (Tetraophasis obscurus). Jiudingshan Nature Reserve, Mao Country, Sichuan Province, China. November.

Melvin Grey / Yellow-throated sandgrouse (Pterocles gutturalis saturatior) male. Ndutu, Tanzania. Medium repro only.

Ingo Arndt / Fawn-breasted brilliant (Heliodoxa rubinoides) hummingbird nectaring on flower. Western slope of Andes, Ecuador. October.

Ingo Arndt / Purple-throated woodstar (Calliphlox mitchellii) hummingbird nectaring on flower. Western slope of Andes, Ecuador. October.

Ingo Arndt / Purple-throated woodstar (Philodice mitchellii) nectaring on Banana (Musa sp) flower. Western slope of Andes, Ecuador. October.

Eric Baccega / Blue-throated macaw (Ara glaucogularis) portrait. Beauval Zoo Parc, France. Captive.

Sandesh Kadur / Wreathed hornbill (Rhyticeros / Aceros undulatus), Assam, India. Vulnerable species.

Sandesh Kadur / Wreathed hornbill (Rhyticeros / Aceros undulatus), Assam, India. Vulnerable species.

Ernie Janes / Purple-throated mountaingem (Lampornis calolaemus) female Costa Rica.

Ernie Janes / Purple-throated mountain gem hummingbird (Lampornis calolaemus) female, Costa Rica.

Oscar Dewhurst / Blue-throated Piping-Guan (Pipile cumanensis) feeding on palm fruits in the Peruvian Amazon. Madre de Dios, Peru. March

Oscar Dewhurst / White-throated antbird (Gymnopithys salvini) held in hand for ringing by researcher at Los Amigos Biological Research Station, Madre de Dios, Peru. April. Cropped

Heather Angel / Altamira oriole (Icterus gularis) nectaring on Quickstick / Mother of cocoa tree (Gliricidia sepium) flower. Chiapas, Mexico.

Heather Angel / Purple throated mountain gem hummingbird (Lampornis calolaemus) hovering as it nectars on Porterweed (Stachytarpheta frantzii). Costa Rica.

Sandesh Kadur / Wreathed hornbill (Aceros undulatus) Assam, India.

Sandesh Kadur / Wreathed hornbill (Aceros undulatus) Assam, India.

Bernard Castelein / Indian Silverbill (Lonchura malabarica), Keoladeo NP, Bharatpur, India

Bernard Castelein / White-throated kingfisher (Halcyon smyrnensis), Keoladeo NP, Bharatpur, India

Bernard Castelein / White-throated kingfisher (Halcyon smyrnensis), Keoladeo NP, Bharatpur, India

Marie Read / Backyard setup for photographing Ruby-throated Hummingbirds (Archilocus colubris) in summer, New York, USA. A natural food plant (cardinal flower (Lobelia cardinalis)) in a floral tube of water is tie...

Marie Read / Backyard setup for photographing Ruby-throated Hummingbirds (Archilocus colubris) in summer, New York, USA. A medical syringe is used to inject a few drops of sugar solution into the flower (set up in...

David Pattyn / Little grebe (Tachybaptus ruficollis) at the edge of a reedbed, Valkenhorst Nature Reserve, Valkenswaard, The Netherlands, April

David Pattyn / Little grebe (Tachybaptus ruficollis) foraging at the edge of a reedbed, Valkenhorst Nature Reserve, Valkenswaard, The Netherlands, April

David Pattyn / Little grebe (Tachybaptus ruficollis) couple mating in a reedbed, Valkenhorst Nature Reserve, Valkenswaard, The Netherlands, April

David Pattyn / Little grebe (Tachybaptus ruficollis) in the early morning mist, Valkenhorst Nature Reserve, Valkenswaard, The Netherlands, June

Richard Du Toit / Slaty egret (Egretta vinaceigula) Chobe National Park, Botswana.

Markus Varesvuo / Red-throated diver (Gavia stellata) in winter plumage, on water. Uto, Paragas, Finland. November.

Markus Varesvuo / Red-throated diver (Gavia stellata) in winter plumage, on water. Uto, Paragas, Finland. November.

Markus Varesvuo / Dipper (Cinclus cinclus) standing on ice at water's edge, at sunset. Kuusamo, Northern Ostrobothnia, Finland. December.

Pedro Narra / Little grebe (Tachybaptus ruficollis) on water. Sado estuary, Portugal. March

Paul Hobson / Red-throated diver (Gavia stellata), head above vegetation whilst sitting on nest. Iceland. June.

Paul Hobson / Red-throated diver (Gavia stellata) pair in courtship display. Iceland. June.

Paul Hobson / Red-throated diver (Gavia stellata) on water. Iceland. June.

Paul Hobson / Red-throated diver (Gavia stellata) approaching nest at water's edge, in evening light. Iceland. June.

Paul Hobson / Red-throated diver (Gavia stellata) on nest at water's edge, in evening light. Iceland. June.

Paul Hobson / Purple-throated mountain-gem (Lampornis calolaemus) nectaring at flower. Costa Rica.

Paul Hobson / Dipper (Cinclus cinclus) in stream. Peak District National Park, England, UK. March.

Staffan Widstrand / Wild Wonders of China / Little Grebe or Dabchick (Tachybaptus ruficollis) swimming in a lake in East Lake Greenway park, Wuhan, Hubei, China

Kerstin Hinze / Dipper (Cinclus cinclus) in a frozen stream, Harz National Park, Saxony-Anhalt, Germany, March.

Kerstin Hinze / Dipper (Cinclus cinclus) foraging in a stream, Harz National Park, Saxony-Anhalt, Germany, March.

Kerstin Hinze / Dipper (Cinclus cinclus) foraging in a stream, Harz National Park, Saxony-Anhalt, Germany, March.

Kerstin Hinze / Dipper (Cinclus cinclus) preening, Harz National Park, Saxony-Anhalt, Germany, March.

Kerstin Hinze / Dipper (Cinclus cinclus) preening, Harz National Park, Saxony-Anhalt, Germany, March.

Philippe Clement / Blue-throated toucanet (Aulacorhynchus caeruleogularis) native to Costa Rica, Panama and Colombia, captive, digital composite

Graeme Guy/ BIA / Blue-throated Bee-eater (Merops viridis) with dragonfly prey, Penang, Malaysia