I would say, No, mdsved, but I'm not an expert. I would not encourage your kitty to eat birds, but it is a natural instinct so I don't think it will hurt them.

However, my mom lets her cat outside on a leash, and he has been known to catch the occassional bird, mole, chipmunk, mouse, whatever he can. One time he got really sick, wouldn't eat or drink for days and just laid around the house. She was about to take him to the vet when he started perking up and eating and drinking again so she never really found out what the problem was, but she figured he must have eaten a critter that was sick or maybe had gotten into some poison somewhere and that made the poor kitty sick.

So if your kitty goes outside, don't feed the birds and encourage them to come around, and if you see your kitty lurking around a bird feeder or something, get the squirt bottle out because you just never know.