What is "thornbill"

Thornbill \Thorn"bill`\, n. (Zo["o]l.) Any one of several species of small, brilliantly colored American birds of the genus Rhamphomicron. They have a long, slender, sharp bill, and feed upon honey, insects, and the juice of the sugar cane.

n. Any of the passerine birds of the genus ''Acanthiza''.

n. any of various South American hummingbirds with a sharp pointed bill