Chionididae (sheathbills; class Aves, order Charadriiformes)
A family of white, pigeon-like birds that have short, stout legs and unwebbed feet. The stout bill is black, or yellow and black, and covered by a horny sheath. Chionidids have bare and wattled
cheeks. Their wings have sharp carpal spurs
. They are gregarious and mainly terrestrial, omnivorous, and holenesting in crevices and burrows. There are two species, found on sub-Antarctic Atlantic and Indian Ocean
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