Wing chord (biology)

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Wing chord measure on a red-billed chough juvenile during ringing.

Wing chord is an anatomical measurement of a bird's wing. The measurement is taken with the wing bent at a 90 degree angle, from the most prominent point of the wrist joint to the most prominent point of the longest primary feather. It is often taken as a standard measurement of the proportions of a bird and used to differentiate between species and subspecies.