Assertion: tern | /r/CapableOf | measure 21 inches
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text: Terns are medium to large seabirds - the smallest tern being the Least Tern, weighing 1.5 oz (42 g) and measuring 9 inches (23 cm), to the largest -- the Caspian Tern, weighing 1.4 lbs (630 g) and measuring 21 inches (53 cm).