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grey-backed

grey-backed, a.
  (ˈgreɪbækt)
  [f. grey a. + back n. + -ed2.]
  Having a grey back. grey-backed crow = grey-back 4 a.

1837 Macgillivray Hist. Brit. Birds I. 529 Grey-backed Crow. 1899 Blackw. Mag. Feb. 417/1 These grey-backed depredators [hoodies].

Oxford English Dictionary

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