Small and compact hummingbird with a hunched posture and a short tail. The male's iridescent purple gorget (throat patch) flares out along the sides of the neck like an overgrown mustache.
When perched the wings barely extend beyond the tail on this tiny, compact hummingbird. Females are greenish above with a white eyebrow stripe, a grayish cheek patch, and whitish underparts.
Gorget color is dark purple, and feathers extend off the sides of the throat. Fairly short wings; wingtips barely extend past the tail.
Males repeatedly perch at 3–4 favorite spots within their territory, usually a dead twig in a palo verde, acacia, or ironwood, and sing a thin high-pitched whistle to proclaim ownership and keep intruders out.
Immature males have variable amounts of adult gorget feathers coming in on the neck. Note whitish underparts and green washing on the sides.
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Costa's Hummingbirds are small and compact hummingbirds with a hunched posture. Their short tail barely meets their short wings when perched. The male's gorget (throat patch) flares out along the sides of the neck like an overgrown mustache.
Larger than a Calliope Hummingbird, smaller than an Anna's Hummingbird.
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