John Chan / Anna's Hummingbird (Calypte anna) chick, sleeping in nest, Southern California, USA, March.
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John Chan / Female Anna's hummingbird (Calypte anna) incubating eggs, departs from nest momentarily to feed, Southern California, USA, March.
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John Chan / Female Anna's hummingbird (Calypte anna) incubating eggs, departs from nest momentarily to feed, Southern California, USA, March.
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John Chan / Male Anna's hummingbird (Calypte anna) cleaning its beak on a twig, Southern California, USA, January.
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Pedro Narra / Bee hummingbird (Mellisuga helenae) hovering in front of flower, Guanahacabibes Peninsula National Park, Cuba
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Pedro Narra / Bee hummingbird (Mellisuga helenae) feeding from flower, Guanahacabibes Peninsula National Park, Cuba
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Diane McAllister / Male Anna's hummingbird (Calypte anna) hovers in mid-air looking at the camera in a backyard in Reno. Nevada, USA, August
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Rolf Nussbaumer / Costa's Hummingbird {Calypte costae} young male feeding on Sage flower, Tuscon, Arizona, USA, September
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John Chan / Anna's hummingbird (Calypte anna) chick in nest, exploring nest area with its tongue, Southern California, USA, March.
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John Chan / Female Anna's hummingbird (Calypte anna) returning to feed its chick, regurgitating insects and nectar into its mouth, Southern California, USA, March.
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John Chan / Anna's hummingbird (Calypte anna) chick stretching its wings in nest, Southern California, USA, March.
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John Chan / Female Anna's hummingbird (Calypte anna) returning to feed its chick, regurgitating insects and nectar into its mouth, Southern California, USA, March.