It's probably the tweety sound it makes... but our finicky cat LOVES this. He hides it all over the house so we can't find it... till one day you're just sitting there and he comes flying in with it in his mouth and tosses it several feet in the air. He got bored with the squeaky mice we'd get him... but this is holding his attention. And he's allergic to cat nip. (Had to find out the hard way) So that's just an extra added bonus that it doesn't have any in it.
