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Agapornis roseicollis
A loud and constant chirper, these birds are very social animals and often congregate in small groups in the wild. They eat throughout the day and take frequent baths. Coloration can vary widely among populations.
Kankaria Zoo
I agree with Zlatan. Please create a new spotting for the Black-cheeked Lovebird, you will need to re-upload those 3 pictures and they can then be removed from this spotting.
I think there are two different species here - in three first photos, that is Black-cheeked lovebird (Agapornis nigrigenis), while in the forth one that could be a Rosy-faced.