Kevin Schafer / Four people lying on ground photographing Arctic / Scheuchzer's cotton grass (Eriophorum scheuchzeri) Edgeoya (Edge Island) Svalbard, Norway 2010

Michio Hoshino / Polar Bear (Ursus maritimus) laying on stomach, Churchill, Manitoba, Canada

Aflo / ic-04101 Bull terrier lying on back in submissive pose looking up.

Jane Burton / Border Collie x (Terrier x Shih-Tzu) 7-month bitch, rolling over submissively on back

Jane Burton / English Springer Spaniel, 5-month pup, rolling over on back in submissive display

Jane Burton / Springer Spaniel rolling over in submissive display

Jane Burton / Chocolate Labrador Retriever pup lying on its stomach.

Fabrice Cahez / Glimpse of Badger (Meles meles) resting on its back. Vosges, France, June.

Espen Bergersen / Walrus (Odobenus rosmarus) lying on its stomach, resting. Svalbard, Norway. August.

Stefan Christmann / Emperor penguin (Aptenodytes fosteri) chick lying on its stomach, aged 18-20 weeks, Atka Bay, Antarctica. December. Bookplate.