There was a 2007 legal case that, though the jury ended in deadlock (as to whether or not the shooting of a cat was legal), suggests that cats do in fact kill migratory birds. Stevenson v Galvestone, I believe.

That's interesting, and I'm curious why someone would know this. Are you in the field?

I started getting cluster headaches a couple years ago, so it isn't true anymore, but I used to have a photographic memory. Useful for picking up lots of entirely useless information.

I see. Thanks for sharing that.