They bask on land or on logs and stumps near the water surface, and swim with their heads elevated above the water and their bodies riding on the water surface. They may vibrate their tails and gape their mouths when threatened. If banded, the bands are widest on the sides and narrow on top.

How do you tell if a snake in the water is poisonous?

THICK, HEAVY BODIES: Venomous Water Moccasins have bodies that are VERY thick and heavy for their length, and short, thick tails. A harmless snake the same length would be much more slender and would have a much longer, thinner tail (see below).

How can you tell the difference between a water snake and a water moccasin?

Water Snakes, like this Northern Water Snake, have bands that are widest on top, whereas Water Moccasins have bands that are widest on the sides. A Northern Water Snake in a threat posture, with the head flared. A juvenile Water Moccasin swimming. Also illustrated is the typical “hourglass” banding pattern.