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

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

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

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.

Jean E. Roche / Aerial view of traffic queueing on road to reach / leave the Espiguette beach in summer, Aigues-Mortes, Camargue, Southern France, August 2008

David Woodfall / Women and children queueing to collecting clean water in industrial slum Bhopal Madyah Pradesh, India, November 2008

Pete Cairns / Visitors at RSPB's Loch Garten Capercaillie Watch in spring queueing to access hide, Cairngorms National Park, Scotland, UK 2006

Denis-Huot / Herd of Common elands (Taurotragus oryx) walking across salt pan. Amboseli National Park, Kenya.

Charlie Hamilton-James / Black rat (Rattus rattus) sitting outside entrance to temple with queue of visitors watching in background, Karni Mata Temple (The Temple of Rats), a Hindu temple dedicated to the Hindu Goddess Karni...

Charlie Hamilton-James / Group of Black rats (Rattus rattus) huddled together sleeping inside temple, with group of women waiting in line in background, Karni Mata Temple (The Temple of Rats), a Hindu temple dedicated to the...