I always wondered why the feral cats in my neighborhood were so fat and healthy looking. They were eating squirrels ;-)
At one point, the management of my apartment complex put out humane traps with food in them. Only once did a cat get caught- usually the food was gone, and no sign of the cat!
We live in a very built-up suburban area; there are no other animals around here that would be taking down squirrels.
But we do have lots of squirrels, and birds; some mice. Kitties in this ‘hood are at the top of the animal food chain.
-JT