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Measurements
Linear
Measurements from Cramp 1985 of specimens from e. and s. U.S.
Bill Length
Male, mean 39.7 mm ± 1.3 SD (range 38–42, n = 16); female, mean 36.7 mm ± 1.1 SD (range 35–39, n = 11).
Wing Length
Male, mean 266 mm ± 4.2 SD (range 258–272, n = 15); female, mean 266 mm ± 4.1 SD (range 260–272, n = 11).
Tail Length
Male, mean 174 mm ± 9.6 SD (range 160–185, n = 8); female, mean 170 mm ± 10.8 SD (range 162–193, n = 8).
Tarsus Length
Male, mean 24.7 mm ± 0.8 SD (range 24–26, n = 15); female, mean 24.1 mm ± 1.0 SD (range 23–25, n = 12).
Mass
Mean mass 158 g ± 16.8 SD (range 127.0–193.0, n = 24 unsexed specimens from Oklahoma; Dunning 1993).
Mcnicholl, Martin K., Peter E. Lowther and John A. Hall. 2001. Forster's Tern (Sterna forsteri), The Birds of North America Online (A. Poole, Ed.). Ithaca: Cornell Lab of Ornithology; Retrieved from the Birds of North America Online: http://bna.birds.cornell.edu/bna/species/595
