Birds seen include the Pied hornbill, Red whiskered bulbul and Drongo. Humblot's flycatcher, Comoro white-eye, Comoro drongo and Karthala scops owl. In India, they have been found to be fed by black drongos and ashy drongo. Avian life includes drongo and nightjar. Terrestrial foragers like babblers may use the drongo as a sentry. It may attack other birds like the spangled drongo or common koel. It was previously considered a subspecies of the greater racket-tailed drongo. The greater racket-tailed drongo is a resident breeder throughout its range. One of these was the greater racket-tailed drongo. The genus "Chaetorhynchus" contains a single species, the New Guinea endemic pygmy drongo. Similar behaviour, using false alarm calls, has been noted in the fork-tailed drongo. One of these was the hair-crested drongo. The iris is dark brown (not crimson as in the similar ashy drongo). The spangled drongo ("Dicrurus bracteatus") is a bird of the family Dicruridae. The spangled drongo is the only drongo to be found in Australia.