Andy Rouse / 2020VISION / Wood Warbler (Phylloscopus sibilatrix) juvenile perched. Wales, April. Did you know? Despite inhabiting woodlands, wood warblers prefer to nest on or close to the ground.

Mark Hamblin / 2020VISION / Research scientists fitting satellite transmitter to Hen harrier chick (Circus cyaneus) for tracking movements after fledging. Glen Tanar Estate, Grampian, Scotland, UK, June 2011. Winner, documentary...

Edwin Giesbers / Adelie Penguin {Pygoscelis adeliae} chick viewed over ice, Antarctica

Todd Mintz / Great Horned (Bubo virginianus) owlet fledging. Saskatchewan, Canada, May.

Todd Mintz / Great Horned (Bubo virginianus) owlet fledging. Saskatchewan, Canada, May.

Todd Mintz / Great Horned (Bubo virginianus) owlet fledging. Saskatchewan, Canada, May.

Todd Mintz / Great Horned Owlet (Bubo virginianus) fledging. Saskatchewan, Canada

Ole Jorgen Liodden / Juvenile White-flippered Penguin (Eudyptula minor albosignata) with some downy feathers remaining, Canterbury, New Zealand November.

Yukihiro Fukuda / Sooty terns (Onychoprion fuscatus) chicks have left nest to start learning how to fly on beach, Christmas Island, Indian Ocean, July

Yukihiro Fukuda / Sooty terns (Onychoprion fuscatus) chicks have left nests to start learning how to fly on beach, Christmas Island, Indian Ocean, July

Yukihiro Fukuda / Sooty tern (Onychoprion fuscatus) chicks leaving nests to start flight training on beach, Christmas Island, Indian Ocean, July

Eric Medard / Little owl (Athene noctua) chick taking first flight, learning to fly, France, June