Constrictor Snakes have large, long heads with distinct dark markings on the top of the head and around the eyes. They’re light brown to tan, with darker brown or reddish hourglass markings along their back and sides. Constrictor Snakes stay close to permanent water sources, like rivers, streams, and wetlands. They’re good swimmers and spend much of their lives in water. But, they can also climb and are sometimes found high in the trees.