The Plumbeous Forest-Falcon is a forest-falcon endemic to the southern Choco biogeographic region in southwestern Colombia and northwestern Ecuador. At various times this species has alternatively been considered a subspecies of Lined Forest-Falcon (Micrastur gilvicollis) of Amazonia, or its own species, but recent field studies have demonstrated unequivocally that the Plumbeous Forest-Falcon is indeed a good species. These studies based their conclusions heavily on vocalizations, which are especially informative for species limits in this genus. The Plumbeous Forest-Falcon is resident in the interior of humid lowland and foothill forest. Apart from its distribution and plumage characters, this species is very poorly known. Nothing is known of the breeding of this species. Its diet is also almost unknown, apart from a report of a land crab and a lizard found in the stomach of one forest-falcon.