The excerpt represents the core issue or deciding factor on which you must meditate, and is drawn from The Voyage of the Beagle by Charles Darwin: 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
 The Voyage of the Beagle |