Ruby-throated Hummingbird
10 cm (3-4"). Common in western lowlands and mountains. A few Black-chins winter in southeast United States and may be mistaken for Ruby-throated hummers.
Male: truly black throat otherwise white underneath.
Females: are white underneath and are not safely told in field from female Costa's or female Ruby-throated.
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Credit: madplanter
Images
Distribution Maps
Black-chinned Hummingbird distribution map
Black-chinned Hummingbird winter distribution map