Jack Dykinga / Burrowing owl (Athene cunicularia) female and ten chicks aged a few weeks. Marana, Arizona, USA. May.

Brian Bevan / Juvenile Green woodpecker (Picus viridis) leaving nest hole, shot looking up trunk, Bedfordshire, England, UK, June.

David Perpinan / Common rock sparrow (Petronia petronia) chick exploring outside nest, Cuenca, Castile-La Mancha, Spain, June.

Frederique Olivier / Emperor penguin (Aptenodytes forsteri) walking with chick, Adelie Land, Antarctica, January.

Ralf Kistowski/ BIA / Common Kingfisher (Alcedo atthis) parent spreading wings near fledgling, North Rhine-Westphalia, Germany

Alain Ghignone/ BIA / Red-backed Shrike (Lanius collurio) mother feeding fledgling, Aosta Valley, Italy

Bence Mate / Two Burrowing owls (Athene cunicularia) fledgling with adult about to take off, Pantanal, Brazil.

Bence Mate / Male Red footed falcon (Falco vespertinus) with rodent for fledgling, Kiskunsagi National Park, Pusztaszer, Hungary. August.

Bence Mate / Burrowing owl (Athene cunicularia) fledgling with head on side, Pantanal, Brazil. November.

Michael Quinton / Northern Flicker (Colaptes auratus) chicks in nest cavity ready to fledge, Alaska

Michael Quinton / Northern Flicker (Colaptes auratus) chicks in nest cavity ready to fledge, Alaska

Michael Quinton / Northern Flicker (Colaptes auratus) chick in nest cavity ready to fledge, Alaska