Square-Tailed Drongo-Cuckoo

The square-tailed drongo-cuckoo is a cuckoo that resembles a black drongo, found along the Himalayas and east into South-east Asia. In flight a white wing-stripe is visible from below. The species once included the form now treated separately as the fork-tailed drongo-cuckoo. The calls are series of piercing, sharp whistles rising in pitch but shrill and choppy (Wikipedia, general species account).