Ammonite / Two Sperm whales (Physeter macrocephalus) swiming near the surface, moving away from the camera, Azores, Portugal, July.

Jussi Murtosaari / Red Fox (Vulpes vulpes) swiming in sea, southwest Finland, February.

Sue Daly / Koheru (Decapterus koheru) shoal swiming around diver, Cavalli Islands, New Zealand, February 2013. Model released.

Charlie Summers / Three Tufted Puffin (Fratercula cirrhata) swimming in formation, St. Lazarus National Wildlife Refuge in Sitka Sound, Alaska, August.

Charlie Summers / Brown Bear (Ursus arctos) swimming in the Anan Creek Lagoon of Alaska, July.

Steven Kazlowski / Young polar bear (Ursus maritimus) in slushy icy water, off the 1002 area of the Arctic National Wildlife Refuge, North Slope of the Brooks Range, Beaufort Sea, Alaska, October.

Steven Kazlowski / Young Polar bear (Ursus maritimus) in slushy icy water, off the 1002 area of the Arctic National Wildlife Refuge, North Slope of the Brooks Range, Beaufort Sea, Alaska, October.

Steven Kazlowski / Young polar bear (Ursus maritimus) submerged, swimming in slushy icy water, off the 1002 area of the Arctic National Wildlife Refuge, North Slope of the Brooks Range, Beaufort Sea, Alaska, October.

Steven Kazlowski / Polar bear (Ursus maritimus) subadult submerged in slushy icy water, off Bernard Spit and the 1002 area of the Arctic National Wildlife Refuge, North Slope of the Brooks Range, Beaufort Sea, Alaska, O...

Loic Poidevin / Coypu (Myocastor coypus) swimming, Marais Breton, Brittany / Bretagne, France, April.

Chris & Monique Fallows / Mako Shark (Isurus oxyrinchus), Cape Point, South Africa, April.

Chris & Monique Fallows / Ragged tooth shark (Carcharias taurus), De Hoop, South Africa, January.