Bence Mate / Keel-billed Toucan (Ramphastos sulfuratus) attacking a Brown-hooded Parrot (Pionopsitta haematotis) Laguna del Lagarto, Santa Rita, Costa Rica

Bence Mate / Collared Aracari (Pteroglossus torquatus) displaying at Montezuma Oropendola (Psarocolius montezuma) Laguna del Lagarto, Santa Rita, Costa Rica

Bence Mate / Keel-billed Toucan (Ramphastos sulfuratus) in aggressive encounter with a Montezuma Oropendola (Psarocolius montezuma), Laguna del Lagarto, Santa Rita, Costa Rica

Bence Mate / Three Brown-hooded Parrots (Pyrilia haematotis) one taking off from branch, in the rain Laguna del Lagarto, Santa Rita, Costa Rica

Gerrit Vyn / Ruddy Duck (Oxyura jamaicensis) male in breeding plumage performing a "bubbling display"which is used in both courtship and aggressive territorial encounters. The male holds its head and tail and 2 ro...

Gerrit Vyn / Aggressive encounter between two male Greater Prairie-Chickens (Tympanachus cupido) on a lek. During these aggressive encounters, males lower their pinnae feathers, deflate their air sacs, leap into t...

Gerrit Vyn / Aggressive encounter between two male Greater Prairie-Chickens (Tympanachus cupido) on a lek. During these aggressive encounters, males lower their pinnae feathers, deflate their air sacs, leap into t...

Mark Moffett / Green and Black Poison Dart Frog (Dendrobates auratus) meets a Tarantula, Taboga Island, Panama Tarantulas eat frogs but avoid Poison Dart Frogs, yet on Taboga, such encounters are common and Tarantul...

David Fleetham / Underwater encounters with Hawaiian monk seals (Monachus schauinslandi) Hawaii

Alex Mustard / Diver encounters a large sunfish (Mola mola), the world's heaviest bony fish. Tulamben, Bali, Indonesia. Java Sea Model released

Alex Mustard / A diver encounters a male cabezon (Scorpaenichthys marmoratus) guarding eggs. This is a large fish which can weigh over 10kg. Edmonds Underwater Park, Seattle, Washington, USA. Puget Sound, North East...

Eric Baccega / Tourists watching and photographing Grizzly bear (Ursus arctos horribilis) from a zodiac boat, Khutzeymateen Grizzly Bear Sanctuary, British Columbia, Canada, June.