Tim Zurowski / Anna's Hummingbird (Calypte anna) male, British Columbia, Canada

Floris van Breugel / Anna's Hummingbird (Calypte anna) with tail feathers outstretched and wings up at sunrise in Mount Diablo State Park, California, USA. February.

Glenn Bartley / Anna's Hummingbird (Calypte anna) male, British Columbia, Canada

Alan Murphy / Anna's Hummingbird (Calypte anna) male visiting a flower, British Columbia, Canada

Floris van Breugel / Anna's Hummingbird (Calypte anna) stretching, Mount Diablo State Park, California, USA, March

Tom Vezo / Anna's Hummingbird (Calypte anna) feeding on flower nectar, Santa Rita Mountains, Arizona

Diane McAllister / Anna's hummingbird (Calypte anna) chicks about to fledge, in their nest in juniper tree in southwest Reno. Nevada, USA, July

David Tipling / Anna's hummingbird (Calypte anna) perched on flower head, San Diego, California, USA, April

Mary McDonald / Anna's hummingbird {Calypte anna} in flight, southern Arizona, USA.

Mary McDonald / Anna's hummingbird {Calypte anna} in flight, southern Arizona, USA.

Shattil & Rozinski / Close up of irridescent gorget feathers of Anna's hummingbird {Calypte anna} USA

Konrad Wothe / Anna's Hummingbird (Calypte anna) male getting nectar from flower stalk, Arizona