The caerulean paradise-flycatcher is a member of the Monarchidiae family, locally known as ‘‘burung niu’’ (Whitten 2006). It is native to Indonesia, and adults are about 5 in (18 cm) in height, with a long tail and long rictal bristles (stiff hairs around the base of the bill) (Riley & Wardill 2001; Whitten et al. 1987). There is scant biometric data for this species, because, other than the type specimen, only one additional specimen was captured, measured, and released in 1998 (Riley & Wardill 2001). The species is described as a bright cerulean blue (which can be likened to a deep blue sky) with gray undertones on the belly, legs, upper wing coverts (feathers) and down the sides of the neck to the breast (BLI 2007d; Riley & Wardill 2001; Whitten et al. 1987).