iBT TOEFL Topic Vocabulary Breakthrough Unit 077

iBT TOEFL Topic Vocabulary Breakthrough Unit 077
Author: Li Xiaolai

77. Nearly all birds have a tail, the paired flight feathers of which, called rectrices, extend from the margins of a bird’s tail. Tails may be square, rounded, pointed, or forked, depending on the lengths of the rectrices and the way they terminate.

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