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Caspian Tern Identification

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The Four Keys to ID

  • Size & Shape

    A large, heavy-bodied seabird (and largest of all terns), with a large head; thick, straight, pointed bill; and shallowly forked tail. The long, pointed wings are broad for a tern.

    Relative Size

    The largest tern species. Larger than a Ring-billed Gull, smaller than a Herring Gull.

    Relative Sizecrow sizedcrow-sized
    Measurements
    • Both Sexes
      • Length: 18.5-21.3 in (47-54 cm)
      • Weight: 18.7-27.6 oz (530-782 g)
      • Wingspan: 49.6-50.4 in (126-128 cm)

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