Yikes! The snake has that look in its eye ... my next meal, but I think rat snakes primarily feed on rodents, small reptiles, & birds. Excellent detail & focus ... you were at the right place at the right time.
You just HAD TO do it Alex!!! You know I hate spiders and snakes, but actually this is an outstanding shot, especially with the snake's appetizer sitting right above his mouth. Nice work my friend!