Domestic cats kill 200 million birds annually in the USA....just for fun.
And it it's a darn good thing too, filthy chattering feathered dinosaurs. When we first moved to my current house, the neighbors had an enormous tomcat wearing one of those veterinary cones. the cat had been pecked raw by bluejays. We train our cats better. We acquired one that would lie in the middle of the yard and wait for the bluejays to attack. As the jay approached, the cat would do a flip at just the right moment, and one less jay. He could also catch dragonflies with the same technique.
He was a neutered male and acted sometimes like a mother cat. He took it upon himself to teach several generations of kittens to hunt.