The decurved bill of a curlew.    From Wordnet, Princeton University. 

Like Podoces, P. humilis possesses a slender, decurved bill, pale brown plumage and a dry, open-country habitat.    From Wordnik.com.  [Archive 2006-05-01] Reference

As I'm staring out at the sport fishing boats through the haze, a line of four large brownish shorebirds with decurved bills flies by.    From Wordnik.com.  [Saturday July 28 -- Stairs and the Usual Suspects] Reference

The zygomatic (quadratojugal) is greatly decurved posteriorly, and the supratemporal is accordingly decurved also.    From Wordnik.com.  [Transactions of the American Philosophical Society] Reference

But note: the claws of the two hind toes are not so sharply decurved, nor so acute at the points, the finger slipping readily over them.    From Wordnik.com.  [Birds of the Rockies] Reference

SITTING ON THE PORCH with a cup of ginger tea, my journal, and bird book, I am watching through my binoculars what I believe to be sunbirds in the garden-elegant, purple-iridescent birds with a decurved bill.    From Wordnik.com.  [Orion Magazine Articles] Reference

My field-glass was soon fixed upon him, revealing a little bird with a long beak, decurved at the end, a grayish-brown coat quite thickly barred and mottled on the wings and tail, and a vest of warm white finely sprinkled with a dusky gray.    From Wordnik.com.  [Birds of the Rockies] Reference

These researches ended in a conviction that nothing like this construction pertained to the Mastodon, whose lower jaw ends in a distinctly decurved extremity, simply suited to give attachment to the muscles of a lip; as is evident on re - ferring to a specimen or to any authentic engraving.    From Wordnik.com.  [Transactions of the American Philosophical Society] Reference