LYNN M. STONE / Grizzly bears (Ursus arctos horribilis) threaten each other with open mouths as they compete over who will occupy a favored fishing site, McNeil River, Alaska, USA, July

Norbert Wu / Flying Gurnard (Dactylopterus volitans) unfolds large wings to confuse and threaten predators, Saba Island, Netherlands Antilles, Caribbean

WILLIAM OSBORN / Dead feral Domestic cats shot and displayed in tree. W Simpson desert, S Australia cats

WILLIAM OSBORN / Dead Red foxes shot and displayed in tree {Vulpes vulpes} W Simpson desert, S

WILLIAM OSBORN / Dead feral Domestic cats shot and displayed in tree. W Simpson desert, South Australia. cats