Call it Jacobin Cuckoo or Pied Cuckoo or Pied Crested Cuckoo, it is a summer visitor to Indian subcontinent. It comes here all the way from Africa. The bird is called harbinger of rains because timing of its coming here is just few weeks prior to the arrival of monsoon in India. Monsoons bring a relief from the sweltering heat in the Indian states. Parched earth is rejuvenated with torrents of water from rains. Thus this bird is a welcome sign here. It is aptly called Rain Bird also.
It is generally confused with Papiha which in reality is brain fever bird. One can spit this bird in this area. I have taken many pictures of it.