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Merlin Bird ID

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    Black-throated Blue Warbler Identification

    Adult Description

    • Small songbird.
    • Short, thin bill.
    • Small white spot on edge of folded wing.
    • Male deep slate blue above with black face, throat, and flanks.
    • Female dull and nondescript.

    Male Description

    Back, tail, and top of head blue-gray. Face and throat black. Black extending in line down sides to flanks. White below. Base of primaries white, showing as a large white patch in flight, but a small white spot near the edge of the wing when folded. Outer tail feathers with large white spots and black tips.

    Female Description

    Tail, wings, back, and head grayish olive-green. Yellowish to cream white stripe above eye. Darkish spot in front of eye extending to ear feathers. Lower eyelid white. Underside whitish to yellowish. White spot at base of primaries. Indistinct pale spot on outer tail feathers.

    Immature Description

    Similar to adult. Back and head feathers of male edged with green, white of undersides tinged yellow, and some white tips to black feathers of throat. Female like adult, but more yellowish and may be without white spot on wing.
    Relative Size

    Relative Sizesparrow or smallersparrow-sized or smaller
    Measurements
    • Both Sexes
      • Length: 4.3-5.1 in (11-13 cm)
      • Weight: 0.3-0.4 oz (8-12 g)
      • Wingspan: 6.7-7.9 in (17-20 cm)