This bird is quite active, moving through trees and occasionally descending to the ground in search of food. It feeds primarily on insects and spiders, catching them along branches or on the forest floor. Black-fronted Nunbirds often live and nest in small family groups. During nesting season, additional adult birds, called helpers, sometimes assist the breeding pair with feeding and caring for the young.

When disturbed, the birds emit a sharp, high-pitched call and may sway their tails in a wide arc as a sign of agitation.

The species prefers dry, open secondary forests, often far from water sources. However, it has also been seen near gallery forests in some regions, such as Goiás, Brazil.

We observed nests in Poconé, Mato Grosso (6 nests), and Alto Parnaíba, Maranhão (3 nests).

We observed breeding activities in October and November both in Poconé and Alto Parnaíba.

The nest is a tunnel dug into the forest floor, with the entrance hidden beneath a thick layer of dry leaves and camouflaged branches. Inside, it is lined with decomposing leaves, sometimes from local trees like jatobá and mamoninha.