|Adult male in-flight, colouring unclear|
Anna's hummingbird (Calypte anna) is 9 to 10 centimetres (3.5 to 3.9 in) long.
It has a bronze-green back, a light grey chest and belly, and green flanks. Its bill is long, straight and slender. The adult male has an iridescent crimson-red crown and throat, and a dark, slightly forked tail. Anna's is the only North American hummingbird species with a red crown. Females and young have a green crown, a grey throat with some red markings, a grey chest and belly, and a dark, rounded tail with white tips on the outer feathers.
These birds feed on nectar from flowers using a long tongue. They also eat small spiders and insects caught in flight. While collecting nectar, they also help in plant pollination. This species sometimes eats tree sap.
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