Red-bellied Water Snake

 

 
30"-62" long, a large, plain dark gray to greenish species with a plain red or yellow belly.  Occasionally the belly scales have dark edges.  This species is found throughout the southeastern and lower midwest into the edges of the plains; disjunct population in the upper midwest.  Lives along river swamps and other forested edges of aquatic habitats.  Tends to be most active in the early evening.  Eats fish, frogs, and tadpoles, and are known to anchor their body in vegetation and fish with their mouth open, grabbing any fish that happens to go by.