Marie Read / California quail (Callipepla californica), male emerging from behind snowbank in winter, Mono Lake Basin, California, USA

Alan Murphy/ BIA / California Quail (Callipepla californica) female, British Columbia, Canada

Tim Zurowski/ BIA / California Quail (Callipepla californica) male, Canada

Tim Zurowski/ BIA / California Quail (Callipepla californica) male, Canada

Glenn Bartley/ BIA / California Quail (Callipepla californica) male, Victoria, British Columbia, Canada

Roger Powell / Crested pigeon (Ocyphaps lophotes). male courting female on a garden fence. Werribee, Victoria, Australia.

Gerrit Vyn / Great Knot (Calidris tenuirostris) performing display flight over its mountain top territory. Chukotka, Russia. May.

Juergen Freund / Crested pigeons (Ocyphaps lophotes) perched on snag, Northern Territory, Australia.

Nick Upton / Herb Paris (Paris quadrifolia) with berry in ancient woodland understorey, Nottinghamshire, UK, June.

Glenn Bartley / California Quail (Callipepla californica) male, British Columbia, Canada

Alan Murphy / California Quail (Callipepla californica) male, British Columbia, Canada

Glenn Bartley / California Quail (Callipepla californica) male, British Columbia, Canada