This allopatry combined with differences in plumage (see appearance) and, apparently, certain measurements, has been the background for the split, but hard scientific data are presently lacking (AOU).

Juveniles have dark brownish or dusky upperparts with each feather typically edged rufous, giving a rather scaly appearance.

A disjunct population occurs in the Tepuis of southern Venezuela (likely to extend into adjacent parts of Roraima in far northern Brazil, but this remains unconfirmed).

These birds surprise and capture most of their prey from cover or while flying quickly through dense vegetation.

The great majority of this hawk's prey are small birds, especially various songbirds such as sparrows, wood-warblers, finches, wrens, nuthatches, tits, icterids and thrushes.

These hawks often exploit backyard bird feeders in order to target congregations of ideal prey.

Rarely, sharp-shinned hawks will also eat rodents, lizards, frogs, snakes, and large insects.

After hatching, the young are brooded for 16 to 23 days by the female, while the male defends the territory and catches prey.

The plain-breasted hawk is fairly common (but easily overlooked due to their secretive behavior) and presently considered safe.