Hello. I recently got my first pet snake, it is a young ball python. I am really enjoying him, however, he is constantly trying to escape from his terrarium. He has succeeded once, but I have secured it so that he doesn't get out and injure himself or get lost. I am just worried that he is unhappy or that his inclosure is too small, etc. He tries to exit out the top and falls over on his back alot. Someone please let me know if this is normal or is my poor snake stressed or unhappy??? The terrarium is 20 gallons and he is approx 1.5 ft long. Thanks, any help would be great.