Lameere's classification is founded on the number of abdominal sterna, the nervuration of the wings, the number of malpighian tubules (whether four or six) and other structural characters. [Please select]
THE ARCTIC TERN STERNA MACRURA Bill slender, red throughout; under plumage ash-grey; tail much forked, longer than the wings; legs orange-red, in other respects very like the last. [Please select]
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THE LITTLE (OR LESSER) TERN STERNA MINUTA Bill orange, with a black tip; feet orange; forehead, and a streak above the eye, white; crown black; upper parts pearl-grey; under, white; tail much forked, shorter than the wings. [Please select]
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