Charlie Summers / Gentoo Penguin (Pygoscelis papua) raft in the face of a wave close to shore. Falkland Islands, December

Angelo Gandolfi / Aerial view of people kayaking on the river Megalos Potamos, between the endemic Cretan palm trees (Phoenix theophrasti) Crete, Greece

Jerry Monkman / A kayaker plays in a hole in Tariffville Gorge on the Farmington River in Tariffville, Connecticut. Class III whitewater. May 2007. Model released.

Jeff Rotman / Group of Bottlenose dolphin (Tursiops truncatus) surfing thorugh and leaping out of the waves, KwaZulu Natal, South Africa

Jeff Rotman / Group of Bottlenose dolphin (Tursiops truncatus) surfing on the waves, KwaZulu Natal, South Africa

Jeff Rotman / Free diver exploring blue water beside coral reef, Sinai, Egypt, Red Sea Model released Model released.

Jeff Rotman / Free diver coming up from dive to explore coral reef, Sinai, Egypt, Red Sea Model released Model released.

Jerry Monkman / Children on boogie boards in surf at Hampton Beach, New Hampshire, USA, August 2008. Model released.

Jerry Monkman / Children on boogie boards at Hampton Beach, New Hampshire, USA, August 2008. Model released.

Jerry Monkman / Young girl boogie boarding at Hampton Beach, New Hampshire, USA, August 2008. Model released.

David Woodfall / Surfers & pleasure boats ride the bore, seen from the river. Severn Estuary. England

David Woodfall / Surfers on the bore. Severn Estuary. England