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Browse three reviewed snakes at a time. Changing pages does not reload or move you away from the myths below.
Crotalus cerastes
Venomous
Crotalus cerastes (Sidewinder) is a small to medium-sized rattlesnake native to arid deserts of the southwestern United States and northern Mexico. It is nocturnal during hot months, uses a characteristic sidewinding locomotion, and possesses venom capable of causing significant local tissue damage and systemic effects; bites require prompt medical attention.
Thamnophis couchii
No medically significant venom known
Sierra gartersnake (Thamnophis couchii) is a small to medium-sized, semi-aquatic natricine snake found in montane and foothill wetland habitats in California and adjacent Oregon and Nevada border areas. It feeds primarily on amphibians, fish, and aquatic invertebrates and is nonvenomous to humans (no medically significant venom known).
Pantherophis slowinskii
No medically significant venom known
Pantherophis slowinskii (Slowinski's Cornsnake) is a nonvenomous North American rat snake found in parts of the southeastern United States and adjacent Canadian records. It is a constrictor that primarily feeds on small mammals, birds, and their eggs. Typically secretive and terrestrial, it may be encountered near forest edges, fields, barns, and rocky outcrops. Homeowners should leave it alone, secure poultry housing, and contact local wildlife or herpetological experts for removal if needed.
Juvenile venomous snakes can deliver medically significant bites, but the common claim that they are automatically more dangerous because they cannot control venom delivery is not supported as a general rule. Adult snakes usually have larger venom glands and can deliver a larger total amount.
Bottom line: Treat every suspected venomous snakebite as a medical emergency, regardless of the snake’s age.
Head shape alone is unreliable. Many nonvenomous snakes flatten or widen the head defensively, and viewing angle can change the apparent shape.
Bottom line: Do not approach a snake to inspect its head. Use multiple traits, location, and a safe-distance photograph.
Tourniquets can worsen tissue injury and are not recommended for typical United States snakebites. Emergency evaluation is more important.
Bottom line: Call 911 or Poison Control at 1-800-222-1222. Keep the person calm and do not cut, suck, ice, or tourniquet the bite.
Young copperheads can have a contrasting yellow or greenish tail tip used in caudal luring. It is soft and tapered, not a segmented rattle. The bright color usually fades with age.
Bottom line: Never move closer to inspect the tail. The feature is a clue, not permission to approach or handle the snake.
Several non-rattlesnake species vibrate their tails when threatened. Dry leaves can make the sound resemble a rattle.
Bottom line: A defensive tail vibration does not identify the species. Keep your distance.