I have an older Amur (Siberian/Russian) rat snake. Ive had him for almost a year now. When I first got him he was awesome. Now he is more interested in biting me then he is in feeding. I do feed him in his cage as the previous owner did. He eats FT rats and I used to just toss it in his cage and he would eat it no problems. Now when I go to put the rat in with him he completely ignores it and tries to bite me. This has only been happening the last couple of weeks maybe a month. Any ideas?