Anup Shah / Common / Plains Zebra (Equus quagga burchellii) close up view of under belly - wide angle perspective. Masai Mara National Reserve, Kenya. August

Alex Hyde / Madagascar reed frog {Heterixalus madagascariensis} underside viewed through glass, Masoala Peninsula National Park, north east Madagascar.

Solvin Zankl / As soon as it entered the water the young Olive ridley sea turtle (Lepidochelys olivacea) struggles against the swell to swim away from the coast. The swimming frenzy lasts for approximately 48 hours...

Juergen Freund / Richard Fitzpatrick releases Grey reef shark {Carcharhinus amblyrhynchos} after inserting transmitter into its belly, as part of the Coral Reef census, Lizard Island, Queensland, Australia, April 2008

Inaki Relanzon / Arctic Tern (Sterna paradisaea) in flight, West coast of Iceland, July 2008

Juergen Freund / Humpback whale (Megaptera novaeangliae) turning underwater, off Tonga

Michio Hoshino / Polar Bear (Ursus maritimus) laying on ice on belly to cool off, Churchill, Manitoba, Canada

Flip Nicklin / Atlantic Spotted Dolphin (Stenella frontalis) underwater portrait with remora attached to belly, Bahamas

Fabio Liverani / Yellow bellied toad defensive display - shows brightly coloured belly, Italy

Fabio Liverani / Yellow bellied toad defensive display to snake, Italy - shows brighly coloured belly

Alex Mustard / White-belly damsel (Amblyglyphidodon leucogaster) photographed against the light patterns created by the setting sun on the surface of the ocean. Gubal Island, Egypt. Strait Of Gubal, Gulf of Suez, Re...

Doug Gimesy / Grey-headed flying-fox (Pteropus poliocephalus) just after having taken a flying high speed belly-dip into the Yarra river at the end of a very hot day. Yarra Bend Park, Kew, Victoria, Australia. Crop...