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Look like Starlings?
Yup @Green Hornet ......

Starlings gather to roost in huge flocks in the winter in some parts of their range, typically between November and February. As more and more birds arrive, they gather into a dense, shapeshifting ball in the sky above their roost known as a murmuration, particularly if a predator is lurking nearby.
Murmuration is a term used only to describe this flocking behavior in Starlings. It stems from the word ‘murmur’, which is a continuous, low humming sound. Observers may hear the sound of their wings, as well as their calls, for up to three-quarters of an hour before the birds descend to rest for the night.