Merlin Bird Graphic

Merlin Bird ID

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    Least Tern Identification

    Adult Description

    Small tern. During breeding, black cap ending at white forehead. Short white eyestripe. Bill yellow with black tip. Back light gray. Underside white. Black leading edge to wing. In nonbreeding plumage has black eyestripe extending to back of head, white top of head, and black bill.

    Immature Description

    Juvenile with U-shaped marks across back. Immature resembles winter adult.
    Relative Size

    Relative Sizebetween robin and crowbetween robin and crow
    Measurements
    • Both Sexes
      • Length: 8.3-9.1 in (21-23 cm)
      • Weight: 1.1-1.6 oz (30-45 g)
      • Wingspan: 18.9-20.9 in (48-53 cm)