Danny Green / Snow Monkey (Macaca fuscata) with snow covered paw in front of mouth, Nagano, Japan, February

Ole Jorgen Liodden / L'Hoest's monkey (Cercopithecus lhoesti) feeding on leaves, Rwanda.

Edwin Giesbers / Orang utan (Pongo pygmaeus) baby hanging from trees, and chewing on fingers, Semengoh Nature reserve, Sarawak, Borneo, Malaysia, Endangered

Bernard Castelein / Grey seal (Halichoerus grypus) yawning on beach, Helgoland, Germany. Second Place in the Comedy Award of the Terre Sauvage Nature Images Awards 2016.

Claudio Contreras / Eastern cottontail (Sylvilagus floridanus) cleaning face, Laredo Borderlands, Texas, USA. April

Wild Wonders of Europe / Lundgren / Young Starry sturgeon (Acipenser stellatus) held in hand showing mouth, at Kavoar House farm, Horia village, close to Danube Delta, Romania, June. Critically endangered.

Mark Carwardine / Hands of a tourist leaning from boat to touch the mouth of a friendly Grey whale (Eschrichtius robustus) San Ignacio Lagoon, Baja California, Mexico, April 2009

Mark Carwardine / Hands of a tourist leaning from boat to touch the mouth of a friendly Grey whale (Eschrichtius robustus) San Ignacio Lagoon, Baja California, Mexico, April 2009

Mark Carwardine / Spectacled caiman {Caiman crocodilus} young held in hand, mouth wide open, Rio Negro, near Manaus, Brazil, Amazonia

Konrad Wothe / Sockeye salmon (Onocorhynchus nerka) being held by man, Alaksa, USA, July

Petra Wegner / Female tricolour Cavalier King Charles Spaniel having teeth brushed, model released

Petra Wegner / Female tricolour Cavalier King Charles Spaniel, having teeth brushed, model released