My cats are obsessed with my Sim animals

It started with Figwit, who was so fascinated with my llama, he started batting at the screen. Fortunately, screens are made of tougher stuff than his claws.

Yesterday, Eilian went after my cow. Pretty soon, I had both sitting in front of the screen, watching the cow and llama. After the cow went to sleep, Eilian investigated behind the screen, but alas, no cow.

Better than a fish tank...anyone else have pets that want to Sim?