Invasion of... crows?

It was probably one of hottest day in history of this time in year, about 12 degC on dec 31, near Pardubice. This is quite normal here actually but crows usually don't fly far outside of city. So imagine them like 10x more concentrated in the city. Sometimes they can make sky almost completely black. (well patch of sky anyways).

I wonder what species will be invading next...

Видео Invasion of... crows? канала Ilusys Systems