abstract:The sheathbills are a family of birds, Chionidae. Classified in the wader order Charadriiformes, the family contains one genus, Chionis, with only two species.
N
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 鞘嘴鸥