uropygium

Noun
  1. Posterior part of a bird's body from which the tail feathers grow (synset 102161006)
    is a type of: tail - the posterior part of the body of a vertebrate especially when elongated and extending beyond the trunk or main part of the body
    is a part of: bird - warm-blooded egg-laying vertebrates characterized by feathers and forelimbs modified as wings

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