poor birds

i know that fausto also had cat behavior. he will pounce and his toys like a cat. he also holds the toys between his paws and lay on his back and scratch with his hind paws on the toy

. but he's not quick enough to catch a bird. but how to stop this behavior.........
the thing is that he has success with catching the bird. he gets his reward by catching them. scolding wont help in this situation. it's just like when theysteal food. the reward is more satisfying than the punishment.
i'm wondering if the birds are healthy.
dirricult situation. i'll think and ask around here how to solve this....