Nick Garbutt / North American bobcat (Lynx rufus) striding through deep snow. Madison River Valley, Yellowstone National Park, Wyoming, USA. January

Paul Hobson / Sanderling (Calidris alba) on beach, Lincolnshire, UK

Jack Dykinga / Greater roadrunner (Geococcyx californianus) running to feed brood with Lizard prey in beak. Catalina State Park, Sonoran Desert, Arizona, USA. June.

Jack Dykinga / Greater roadrunner (Geococcyx californianus) running to feed brood with Lizard prey in beak. Catalina State Park, Sonoran Desert, Arizona, USA. June.

George Sanker / Purple gallinule (Porphyrio martinicus) striding over Lily (Nymphaeaceae) pads. Everglades National Park, Florida, USA. March.

George Sanker / Purple gallinule (Porphyrio martinicus) striding over Lily (Nymphaeaceae) pads. Everglades National Park, Florida, USA. March.

David Tipling / Australian Brush Turkey (Alectura lathami) striding across car park in Noosa, Queensland, Australia

David Tipling / Australian Brush Turkey (Alectura lathami) striding across car park in Noosa, Queensland, Australia

Ernie Janes / Female Pheasant (Phasianus colchicus) striding over grassland with tail feathers raised, UK

LYNN M. STONE / Wood Stork (Mycteria americana) adult striding across marine grass and kelp during extreme low tide. Tarpon Springs, Florida, USA, November.

LYNN M. STONE / Wood Stork (Mycteria americana) adult striding across marine grass and kelp during extreme low tide. Tarpon Springs, Florida, USA, November.

Luiz Claudio Marigo / Jabiru Stork (Jabiru mycteria) spreading wings while striding beside the Piquiri River. The Pantanal wetlands of Mato Grosso State, Brazil, October.