openbill
/ˈəʊp(ə)nbɪl/noun
Either of two snail-eating storks of the genus Anastomus, A. lamelligerus of Africa and A. oscitans of Asia, which have mandibles that only meet at the tips, leaving a wide gap in the middle of the closed bill.
Origin
Mid 19th century; earliest use found in William Swainson (1789–1855), naturalist and artist. From open + bill.