I have been observing this bird in my surrounding since month. It makes a loud melodious sound. Does someone know which bird species is this?
The location is western India
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Asian Koel (wikipedia), specifically a female.
CC-BY-SA 3.0 Wikipedia user Dougjj
It's a member of the cuckoo family, and like other cuckoos it's a brood parasite. This species is found across much of southern and eastern Asia.
The background of the pictures suggested India to me, confirmed by the OP's profile. I've only visited India once but I still have my field guide. The bill shape and long tail suggested I should look around the cuckoos, and there it was.