Sylvester (boy) lets me scratch him on his nose (well, between his eyes, you know what I mean), he has his cautious moments (hes only around 3-4 months), but he is adventurous a lot of the time, but he has just started this weird behaviour. When I put my hand in there he runs at my hand, bites (reasonably hard- not blood or anything
), and then jumps off... He did it like 3 times within about half an hour... I don't know if he thought I was putting a carrot or something into his house, or if he was being aggressive 
Anyone's advice would be hugely appreciated, thank you!!!!!!!!!!!!!