Gabriel Rojo / South american tern with chick {Sterna hirundinacea} Valdez peninsula, Argentina

Tom Vezo / Masked / Blue faced booby (Sula dactylatra) chick, Hood Island, Galapagos

Shattil & Rozinski / American dipper {Cinclus mexicanus} chicks calling in nest, Colorado, USA

TJ Rich / African Lion cub (Panthera leo) South Luangwa NP, Zambia

Dave Watts / Water pipit at nest with hungry chicks {Anthus spinoletta} Pyrenees, France

Jose Luis GOMEZ de FRANCISCO / Calandra lark chicks calling in nest {Melanocorypha calandra} Spain

Jose Luis GOMEZ de FRANCISCO / Calandra lark at nest with chicks {Melanocorypha calandra} Spain

Jose Luis GOMEZ de FRANCISCO / Crested lark at ground nest with chicks {Galerida cristata} Spain

Jose Luis GOMEZ de FRANCISCO / Herring gull chicks calling {Larus argentatus} Spain

Yves Lanceau / Domestic hen (Gallus gallus domesticus), crossbreed domestic chicken, chick calling, 10 days

Yves Lanceau / Domestic hen (Gallus gallus domesticus), crossbreed domestic chicken, chick, 10 days