My corn snake is about two years old. He's around three feet long, and I fed him last night after not having the ability to the past couple of weeks. When I fed him, I gave him F/T hoppers and he ate them, problem free. Now whenever he opens his mouth water/saliva/clear goopy stuff drips from it. I'm very scared/confused/worried about him because he's a great addition to the family. What's wrong? Does anyone know?