单词	sheathbill
释义	sheathbill /ˈʃiːθbɪl / noun A mainly white pigeon-like bird with a horny sheath around the base of the bill, breeding on the coasts of sub-Antarctic islands and feeding by scavenging. Family Chionididae and genus Chionis: two species. Some species such as skuas (Catharacta spp.), jaegers (Stercorarius spp.), and sheathbills (Chionis spp.) are considered obligate kleptoparasites, particularly during the breeding season or on migration.... In addition to sheathbills, he worked on albatrosses, petrels, penguins, and terrestrial invertebrates. One group is studying kelp gulls, south polar skuas and sheathbills and another group is studying Adelie penguins.
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