The minute hermit is one of the world's smallest birds. It is long and weighs. The male has dark iridescent green upperparts and a dark brown throat. The female's underparts are reddish orange. Both sexes have a black "mask" and a pale supercilium and malar stripe.
The minute hermit's breeding season spans from October to February. Males display to females at leks. Its nest is an open cup suspended from the underside of a drooping leaf. The clutch of two eggs is incubated solely by the female.
Vocalization
The minute hermit's song is "a high-pitched note repeated 3–4 times, followed by an accelerated descending warble" sung from a low perch.