The Brown Sicklebill shows a strong difference between adult males and females in plumage and ornamentation. It eats fruit and small animals in New Guinea's mountain forests.
Adult males have blue-green and purple iridescence, a sickle-shaped bill, and long ornamental feathers on the chest and flanks. Females are brown and lack the male's iridescence.
It eats fruit as well as animal food, mainly arthropods and insects.
An extinction-risk assessment has not been added yet.