The chin is pale rufous ("fulvous") that blends to reddish brown on the throat and breast.

Its diet is also not known, "but almost surely this species primarily consumes large arthropods, perhaps supplemented by very small vertebrates.

However, its close relative the rusty-breasted nunlet nests in a shallow scrape on sloping ground that it roofs with twigs and leaves.

[5] The IUCN has assessed the fulvous-chinned nunlet as being of Least Concern, though its population is unknown and believed to be decreasing.

[7][8] Though no specific threats have been identified, "[a]s is the case with all species of Amazonian forest birds, Fulvous-chinned Nunlet is vulnerable to habitat loss or degradation from a wide range of human activities.