Looking at the bills, they appear to be juveniles - possibly black-headed juveniles. What do they look like from the front? On the following pages are photos of adults: https://www.beautyofbirds.com/blackheadedmunias.html ... If you see many adult black-headed munias, they are likely to be their young .... could also be an Indian Silverbill https://www.beautyofbirds.com/indiansilverbills.html
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Juveniles Black-headed Munias