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

Plum-headed Parakeet
Psittacula cyanocephala
The plum-headed parakeet is a mainly green parrot, 33–37 cm (13–15 in) long with a weight of 55–85 g (1.9–3.0 oz). Its tail has a length of up to 22 cm (8.7 in). The male has a red head which shades to purple-blue on the back of the crown, nape and cheeks, while the female has a blueish-gray head. There is a narrow black neck collar with verdigris below on the nape and a black chin stripe that extends from the lower mandible. There is a red shoulder patch and the rump and tail are bluish-green, the latter tipped white. The upper mandible is orangish-yellow, and the lower mandible is dark.
ID text from Wikipedia, CC BY-SA 4.0
Where you might meet both
Learn this pair in the BeakBrain App
Photo and call practice. Coming soon to iPhone and Android.
Play today's Daily BirdPhotos and recordings are credited to their authors under the licence shown. Full profiles: Blue-winged Parakeet and Plum-headed Parakeet.