Blue-winged Parakeet
Psittacula columboides
The blue-winged parakeet is bluish grey with a long yellow-tipped tail. The black neck ring is complete in both males and females. The male has a bluish-green lower edge to the black collar and the upper mandible is red with a white tip while the female has an all black bill and has only the black collar. The female looks similar to the female of the plum-headed parakeet which however can be told apart by its broad yellow collar. Flocks move through the forest while calling out in a series of screeching keek-keek-keek calls.
ID text from Wikipedia, CC BY-SA 4.0

Long-tailed Parakeet
Psittacula longicauda
It is mainly green with a long blue tail. The male has a black cap and red cheek or face. The female lacks the black cap and has less red cheek.
ID text from Wikipedia, CC BY-SA 4.0
Where you might meet both
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Play today's Daily BirdPhotos and recordings are credited to their authors under the licence shown. Full profiles: Blue-winged Parakeet and Long-tailed Parakeet.