SHEATHBILL
Etymology
Noun
sheathbill (plural sheathbills)
Either of two species of scavenging birds in the family Chionididae which breed only on the Antarctic Peninsula and subantarctic islands.
Source: Wiktionary
Sheath"bill`, n. (Zoöl.)
Definition: Either one of two species of birds composing the genus Chionis,
and family Chionidæ, native of the islands of the Antarctic.seas.
Note: They are related to the gulls and the plovers, but more nearly
to the latter. The base of the bill is covered with a saddle-shaped
horny sheath, and the toes are only slightly webbed. The plumage of
both species is white.
Source: Webster’s Unabridged Dictionary 1913 Edition