Harpactes duvaucelii or commonly known as the scarlet-rumped trogon is a small-sized bird measuring about 24 cm in length. It belongs to the family Trogonidae. This species occurs in Brunei, Indonesia, Malaysia, Myanmar and Thailand where it inhabits subtropical or tropical moist lowland forests, swamps and montane forests. It usually perches in lower and middle storey, turning its head slowly to look for insects.

The male scarlet-rumped trogon has a black head and throat, scarlet breast and abdomen, a cinnamon-brown back and a bright, large rounded patch of scarlet on the rump, white bars on its wings' sections, and a blue bill. While the female has greyish brown head and upperparts, pale buff-brown rump, olive breast and light orange on the lower underparts. The scarlet-rumped trogon was categorized as Near Threatened (NT) by the IUCN Red List due to habitat loss.