sicklebill

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun Any of several birds of paradise of the genus Epimachus of New Guinea, having a long curved bill like a sickle.
• noun Either of two hummingbirds (Eutoxeres aquila or E. condamini) of South and Central America having similar bills.
• noun Any of several other birds with similar sharply curved bills, such as Falculea palliata, a passerine bird of Madagascar.

from The Century Dictionary.

• noun A name of various birds whose bill is sickle-shaped or falciform; a saberbill.
• noun The California thrasher, Harporhynchus redivivus.

from the GNU version of the Collaborative International Dictionary of English.

• noun Any one of three species of humming birds of the genus Eutoxeres, native of Central and South America. They have a long and strongly curved bill. Called also the sickle-billed hummer.
• noun A curlew.
• noun A bird of the genus Epimachus and allied genera.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun Any of several birds with a sickle-shaped bill