Hi All, any helpful info would be greatly appreciated! We have two young male rats, one is quite nervous but sweet natured the other has much more confidence, is pushy and interactive. The pushy one has started to bite! I could understand if he was frustrated or mistreated but neither of these apply, he has at least three hours a day out of the cage which is pretty huge in its self. He isn’t treated any differently from the other and they are given plenty of fresh healthy food and water. He has started to chase our feet and bite at them and when he gets the chance will pounce onto our arms hang on for dear life and attack us with his teeth!! has our rat gone mad! Or could he be sick? Any ideas?