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Merlin Bird ID

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    Arctic Tern Identification

    Adult Description

    • Medium-sized tern.
    • White with black cap.
    • Tail long and deeply forked.
    • Wings white with some dark at tips.

    Immature Description

    Juvenile with brown or grayish bars across back. Immature resembles winter adult.
    Relative Size

    Relative Sizebetween robin and crowbetween robin and crow
    Measurements
    • Both Sexes
      • Length: 11.0-15.3 in (28-39 cm)
      • Weight: 3.2-4.2 oz (90-120 g)
      • Wingspan: 25.6-29.5 in (65-75 cm)