I remember seeing an Ozzy interview about what happened.

In short, he didn’t eat it, but he did bite its head off. Why? Because he thought it’d look cool after someone had thown what Ozzy assumed was a toy bat. “Because who the fuck brings a luve bat to a concert and throws it on stage?”

Also, he wasn’t hospitalized. He just went and got a tetanus shot or something like that to be safe.