The gray-tailed mountain-gem (Lampornis cinereicauda) is a species of hummingbird. It lives in the mountains of southern Costa Rica from the Cordillera de Talamanca southward to the border with Panama.
Male gray-tailed mountain-gems have iridescent emerald green with a thouch of a bronzy brown mixed in. It has a gray tail, a bright blue-green forehead and top of the head, and a bright white throat next to iridescent blue-green on the upper belly. Both male and female have a straight, thin, black bill, a white stripe behind the eye, and blackish wings.
The female gray-tailed mountain-gem are colored quite different then the male. They have an iridescent bronzy emerald green from the forehead, all the way to the tail, covering the whole backside. Their whole front side is a tan-orange color, all the way from the chin, to the lower belly; and a white-tipped, green tail, completes the coloring of the female.
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