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Blue-throated Mountain-gem Identification

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The Four Keys to ID

  • Size & Shape

    A large hummingbird with a rather long, slightly decurved bill. It has a long, full tail and long wings.

    Relative Size

    Larger than a Broad-tailed Hummingbird, smaller than a Bridled Titmouse.

    Relative Sizesparrow or smallersparrow-sized or smaller

    • Both Sexes
      • Length: 4.3-4.7 in (11-12 cm)
      • Weight: 0.3-0.3 oz (8.1-8.6 g)

Regional Differences

Ornithologists recognize three very similar subspecies, two of which occur in the United States. In Arizona and New Mexico, bessophilus is the breeding subspecies, while in far western Texas, phasmorus is found mostly in the Chisos Mountains. The largest of the three subspecies, clemenciae, occurs in Mexico.