Arnot's chat ranges in size from 16 to 18 cm (6.3–7.1 in) and weighs around 35 g (1.2 oz). The plumage of the adults is sexually dimorphic; the male of the nominate race is overall black with a white crown and a white patch on the wing coverts. The female is similar but with a black crown and a white (tipped with black) throat and neck. The bill and legs are black. Juvenile birds are like the adults but with white feather tips on the crown or throat instead of fuller white. The male of the race harterti has less extensive white on the wings and a mostly black head with a small area of white on the forehead and above the eye; the white throat of the female is also less extensive than on the nominate.
Diet & Behavior: Forages in mid-to-low tree levels and on the ground; often in pairs or family groups.
Vocalization: Features a fast, exuberant song of clucks, whistles, and rattles.
Nesting: Builds nests in tree holes, sometimes using old woodpecker holes, filling them with debris.
Conservation: Experiences local declines due to habitat destruction and DDT, according to BirdLife International.
Name Origin: Named after a Canon Tristram, who mistakenly spelled the knight's name as "Arnott" when assigning the honorific, says Birds of the World.