I recently got a male umbrella cockatoo. He's fitting in great and has no history of abuse or aggressive behaviour. Him and I cuddle lots, watch tv and spend lots of time together. I went to sleep at a friends house last night and he stayed with the rest of the family. He greats along just as well with them. This afternoon when I got home he was happy to see me. But than soon jumped onto me and started biting repeatedly until I was able to pull him off and get my dad to help. He's done this 5 times this afternoon. I'm not sure why or how to stop this behaviour. Help!