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