They only do so, probably, when driven to it by hunger.

Both species are gregarious, although they do not always appear in flocks.

The buzzards, particularly, are often seen hunting alone, or in twos or threes; but their mode of life brings them together in large numbers.

They often assemble--both buzzards and black vultures--to the number of hundreds, over a single carrion.

The buzzards, however, are not so plenty as the black vultures; and in one of these flocks more than three-fourths will be found of the latter species.