Although thus common in these dry and open countries, and likewise on the arid shores of the Pacific, it is nevertheless found inhabiting the damp impervious forests of West Patagonia and Tierra del Fuego.

The Carranchas, together with the Chimango, constantly attend in numbers the estancias and slaughtering-houses.

If an animal dies on the plain the Gallinazo commences the feast, and then the two species of Polyborus pick the bones clean.

These birds, although thus commonly feeding together, are far from being friends.

When the Carrancha is quietly seated on the branch of a tree or on the ground, the Chimango often continues for a long time flying backwards and forwards, up and down, in a semicircle, trying each time at the bottom of the curve to strike its larger relative.