Kristina, he is a quite handsome young man. I have three altered toms (I think they make the best pets) who all nibble when scratched. I believe this is receprical grooming behaviour. He looks to be more of a bobtail than a manx. If the tailbone is twisted or curved he's a bobtail and if straight a stumpy. A true manx has a soft depression where the tailbone would be (a form of spina bifica).