Previously considered a subspecies of the Golden-bellied Starfrontlet (Coeligena bonapartei), the critically endangered Dusky Starfrontlet is now usually considered its own species. It has an incredibly small range supporting only a tiny remaining population in northwestern Colombia. Deforestation plagues this region and potential mineral extraction remains a serious threat to the already declining population. The basic ecology of the Dusky Starfrontlet is poorly known but it inhabits elfin forests around the páramo and neighboring humid forests where it eats insects, arachnids, and probably nectar. These hummingbirds have glistening dark green bodies and tails.