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Bogertophis subocularis
No medically significant venom known
Bogertophis subocularis (Trans-Pecos Ratsnake) is a nonvenomous colubrid native to the Chihuahuan Desert region. Primarily nocturnal and semi-fossorial, it feeds on small mammals, birds, and lizards. Encounters are most likely near rocky desert slopes, arid scrub, washes, and sometimes around human structures in its range (CA, MX, US — primarily TX and adjacent areas).
Rena segrega
No medically significant venom known
Small, secretive burrowing snake found in arid and semiarid regions of the Trans-Pecos and adjacent areas. Non-aggressive, primarily subterranean, often encountered accidentally when soil or surface objects are disturbed. Not dangerous to humans.
Sonora annulata
Potentially venomous
Small, mildly rear-fanged colubrid native to arid and semi-arid regions of the southwestern United States and northern Mexico; primarily nocturnal and secretive, often found under surface cover and in loose sandy soils where it forages for small desert prey.
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.