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sheathbill in British English
(ˈʃiːθˌbɪl)
noun
either of two pigeon-like shore birds, Chionis alba or C. minor, of antarctic and subantarctic regions, constituting the family Chionididae: order Charadriiformes. They have a white plumage and a horny sheath at the base of the bill
sheathbill in American English
(ˈʃiθˌbɪl)
noun
any of a family (Chionidae) of white-plumed antarctic shorebirds distinguished by a horny, saddlelike sheath at the base of the upper bill
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