Stefan Christmann / Emperor penguin (Aptenodytes forsteri) group clambering up slope during journey to bring back food for young. Atka Bay, Antarctica. September.

Will Burrard-Lucas / Three Ethiopian wolf (Canis simensis) pups waiting for their parents to return, Ethiopia.

Anup Shah / Eastern White-bearded Wildebeest (Connochaetes taurinus) herd crossing the Mara River. Maasai Mara National Reserve, Kenya.

Theo Bosboom,Theo Bosboom / Arctic tern (Sterna paradisae) on telegraph lines, near a small village on the Reykjanes peninsula in the south west of Iceland, June

Konrad Wothe / Barn Swallow (Hirundo rustica) chicks lined up in nest with their mouths open waiting for food, Germany

Francisco Marquez / Volunteers standing in a line, waiting to ring Greater flamingo (Phoenicopterus ruber) juveniles, Fuente de Piedra lagoon, Malaga, Spain. August.

Francisco Marquez / Volunteers holding Greater flamingo (Phoenicopterus ruber) juveniles to be measured during the ringing process, Fuente de Piedra lagoon, Malaga, Spain. August.

David Fleetham / Diver hanging on a line at 15 feet for a decompression stop before surfacing. Kauai, Hawaii. March 2016. Model released.

Sue Flood / Emperor penguins (Aptenodytes forsteri) four adult penguins stand in row waiting going to sea to feed. Gould Bay, Weddell Sea, Antarctica.

John Cancalosi / People queuing to vote during Kenyan election, near Kitale Kenya, August 8, 2017,

John Cancalosi / People queuing to vote during Kenyan election, near Kitale Kenya, August 8 2017.

Pal Hermansen / Masai people queuing to vote on election day, Kenya, March 2013.