Black-thighed Falconet

This is a minute, shrike-like falcon, with a squarish tail that is frequently spread. The adult male is glossy black above, with a white forehead streak that arcs around black cheeks. It has a white or rufous-washed throat, with a white breast shading into a rufous abdomen. Its thighs and flanks are black, as is its cere and legs. In flight the male has white wings underneath with black barring on the primaries and secondary flight feathers, and light streaking on the underwing coverts. There are three white bars underneath on the otherwise plain black tail. The adult female is similar to the adult male, except the tail is longer. The juvenile is similar to the adults, except that the white areas of the head are rufous. The voice is a hard, high-pitched cry shiew and a fast repeated kli-kli-kli-kli.

The typical habitat is forest, forest edge and wooded open area. It can also frequently be found around human cultivation, villages, and near active slash-and-burn forest clearance; often by rivers, streams, and paddy fields. It mostly lives below 1,500m elevation.

This falconet is generally social and gregarious, often found in loose pairs or groups of ten or more. The breeding season for this falcon varies by location, with populations up to the North of the equator breeding mostly in February–June. To the South of the equator, egg-laying is recorded in Java in November–December. This falconet usually uses old nest holes of barbets, or occasionally old woodpecker holes. No material is added in the cavity aside from insect remains. The typical clutch size is between 2-5 eggs. Incubation and fledging periods are unknown. The nest hole may be used as a roost by adults year-round.

This falconet mainly feeds on insects, including moths, butterflies, dragonflies, alate termites and cicadas, occasional small birds, and lizards. Feeding behaviour appears to often be social, with feeding parties up to ten recorded. Much of the prey is taken during quick flights from a perch.