I have before described the carrion-vulture of Polyborus.    From Wordnik.com.  [Journal of researches into the geology and natural history of the various countries visited by H.M.S. Beagle] Reference

The Polyborus Chimango is considerably smaller than the last species.    From Wordnik.com.  [Journal of researches into the geology and natural history of the various countries visited by H.M.S. Beagle] Reference

Can see some similarity between seriemas and Polyborus - type caracaras.    From Wordnik.com.  [Giant hoatzins of doom] Reference

According to ornithologists, the bird on the national crest is most likely to be a Crested Cara-Cara (Polyborus plancus).    From Wordnik.com.  [Did You Know? Some national symbols in Mexico are not what they seem] Reference

In this list may be included four species of the Caracara or Polyborus, the Turkey buzzard, the Gallinazo, and the Condor.    From Wordnik.com.  [Journal of researches into the geology and natural history of the various countries visited by H.M.S. Beagle] Reference

If an animal dies on the plain the Gallinazo commences the feast, and then the two species of Polyborus pick the bones clean.    From Wordnik.com.  [Journal of researches into the geology and natural history of the various countries visited by H.M.S. Beagle] Reference

It is not, however, peculiar to that bird: the Polyborus, snipe, upland and lowland goose, thrush, bunting, and even some true hawks, are all more or less tame.    From Wordnik.com.  [Journal of researches into the geology and natural history of the various countries visited by H.M.S. Beagle] Reference

Sometimes seen feeding alongside vultures at carcasses is the longer-necked and larger-headed crested caracara (Polyborus plancus), a hawk with distinctive markings.    From Wordnik.com.  [Did you know? Mexico's vultures have very different eating habits.] Reference

Another species is the Polyborus Novæ Zelandiæ, which is exceedingly common in the Falkland Islands.    From Wordnik.com.  [Chapter III] Reference

Again, I am so obstinate that I should require very good evidence to make me believe that there are two species of Polyborus.    From Wordnik.com.  [More Letters of Charles Darwin — Volume 1] Reference

It is not, however, peculiar to that bird: the Polyborus, snipe upland and lowland goose, thrush, bunting, and even some true hawks, are all more or less tame.    From Wordnik.com.  [Chapter XVII] Reference

Often after he has thus slain them, he leaves their bodies untouched for the Polyborus and vulture to feast on, so great a delight does he take in destroying life.    From Wordnik.com.  [The Naturalist in La Plata] Reference

Except for the Caranchos (Polyborus plancus), these kind of South American hawks that have wings shaped like condors ', there seemed to be no movement or people anywhere.    From Wordnik.com.  [Matador Network] Reference

Polyborus sp. in.    From Wordnik.com.  [More Letters of Charles Darwin — Volume 2] Reference

Crested Caracara, Polyborus plancus.    From Wordnik.com.  [CreationWiki - Recent changes [en]] Reference

Polyborus chimango, 58, 209.    From Wordnik.com.  [Journal of researches into the geology and natural history of the various countries visited by H.M.S. Beagle] Reference