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Merlin Bird ID

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    Bonaparte's Gull Identification

    Adult Description

    • Small gull.
    • White triangle in outer part of wing.
    • Back pale gray.
    • Underparts white.
    • Head black during breeding.
    • Dark spot behind eyes in winter.

    Immature Description

    Juvenile with much brown on head, neck, and back, a dark bar across the wing, and a black tail tip. Immature similar to nonbreeding adult, but with brownish black bar across the base of the wing, much black in the outer wing, and a black band across the tip of the tail. In first breeding plumage the black head is partly mottled with white.
    Relative Size

    Relative Sizecrow sizedcrow-sized
    Measurements
    • Both Sexes
      • Length: 11.0-15.0 in (28-38 cm)
      • Weight: 6.3-7.9 oz (180-225 g)
      • Wingspan: 29.9-31.5 in (76-80 cm)