Snakes are reptiles that can be referred to as legless lizards. Their thin, elongated bodies are covered in scales and can be a variety of different colors and sizes, depending on the species. Most snakes are between 4 inches and 30 feet long.

Regardless of the species, all snakes have forked tongues, a lack of eyelids and external ear openings and tiny curved teeth. Enlarged teeth, called fangs, accompany the curved teeth in the mouths of venomous species. The majority of venomous snakes in the United States differ from non-venomous species in that they have triangular-shaped heads, a depression between the eyes and nostrils and small slit-like eyes.