Rattlesnake
Northwestern Neotropical Rattlesnake
VenomousCrotalus culminatus
6 photographs of the Northwestern Neotropical Rattlesnake. © Juan Antonino Sandoval.
The Northwestern Neotropical Rattlesnake (Crotalus culminatus) is a venomous snake in the Viperidae family.
If you are bitten
Rattlesnake bites are medically serious. Expect intense pain, rapid swelling, and bruising. Stay calm, keep the bitten limb still and roughly level with the heart, remove rings and tight clothing, and get to an emergency room immediately. Do NOT apply a tourniquet, cut the wound, apply ice, or try to suck out venom. Call Poison Control at 1-800-222-1222 or 911 in the US, or your local emergency number. (Source: CDC.)
- Also called
- Rattlesnake
- Family
- Viperidae
- Size
- Typically 2–5 ft; some species exceed 6 ft.
- Habitat
- Deserts, rocky outcrops, grasslands, and woodland edges, depending on species.
- Behavior
- Ambush predators that buzz the tail as a warning; mostly active in warm months and often crepuscular in summer heat.
- Identify
- Heavy body, broad triangular head, vertical (cat-like) pupils, and a segmented keratin rattle at the tail tip.
- Danger
- high
About the Northwestern Neotropical Rattlesnake
Crotalus culminatus, the Northwestern Neotropical rattlesnake, is a species of venomous snake in the genus Crotalus found in Mexico.
Etymology
The specific name, culminatus, comes from the Latin words "culmen" (ridge) and "-atus" (provided with), referring to this snake's strong vertebral ridge.
Description
The Northwestern Neotropical rattlesnake is a large species, with adults reaching lengths of 100 to 180 cm (approximately 39 to 71 inches). It has a heavy body with strongly keeled scales. The coloration is creamy yellow, becoming gray towards the tail, with diamond-shaped black markings on the back and longitudinal lines on the neck.
This species has a myotoxic-hemotoxic venom, which can cause hemorrhaging and induce localized paralysis via muscle damage. While it is less deadly to humans than some of its close relatives, it can still cause significant harm.
Geographical range
Crotalus culminatus is found across much of southwestern Mexico, inhabiting a wide range of elevations from near sea level up to 2285 meters in the Sierra de Coalcomán. It can be found in arid environments, tropical scrub forests, savannas, and mesic forests, with rocky outcroppings being central to its habitat needs.
Diet
This species is likely a generalist predator, with reported prey items including rodents, lizards, and small birds.
Adapted from Wikipedia, available under CC BY-SA.
Frequently asked: Northwestern Neotropical Rattlesnake
- Is the Northwestern Neotropical Rattlesnake venomous?
- Yes. The Northwestern Neotropical Rattlesnake (Crotalus culminatus) is venomous and belongs to the Viperidae family (rattlesnake). Its bite is considered high risk to people. Treat any bite as a medical emergency.
- Is the Northwestern Neotropical Rattlesnake poisonous?
- Snakes are venomous, not poisonous. "Poisonous" means harmful to eat or touch; "venomous" means injecting toxins through a bite. The Northwestern Neotropical Rattlesnake is venomous, delivering venom through a bite.
- Is the Northwestern Neotropical Rattlesnake dangerous?
- Rattlesnake bites are medically serious. Expect intense pain, rapid swelling, and bruising. Stay calm, keep the bitten limb still and roughly level with the heart, remove rings and tight clothing, and get to an emergency room immediately. Do NOT apply a tourniquet, cut the wound, apply ice, or try to suck out venom. Call Poison Control at 1-800-222-1222 or 911 in the US, or your local emergency number. (Source: CDC.)
- How do I identify the Northwestern Neotropical Rattlesnake?
- Heavy body, broad triangular head, vertical (cat-like) pupils, and a segmented keratin rattle at the tail tip.
- How big does the Northwestern Neotropical Rattlesnake get?
- Typically 2–5 ft; some species exceed 6 ft.
- What does the Northwestern Neotropical Rattlesnake eat?
- This species is likely a generalist predator, with reported prey items including rodents, lizards, and small birds.
- Why is it called the Northwestern Neotropical Rattlesnake?
- The specific name, culminatus, comes from the Latin words "culmen" (ridge) and "-atus" (provided with), referring to this snake's strong vertebral ridge.
If you are bitten by the Northwestern Neotropical Rattlesnake
Do
- Get away from the snake and stay calm. Most bites worsen when people panic or try again to handle the snake.
- Call 911 or Poison Control (1-800-222-1222) right away. Antivenom works best when given early.
- Note the time of the bite and, from a safe distance, the snake's color and pattern, a phone photo is enough. Do not chase it.
- Keep the bitten limb still and at roughly heart level. Sit or lie down and limit movement.
- Remove rings, watches, and tight clothing near the bite before swelling starts.
- Gently wash the bite with soap and water and cover it with a clean, dry dressing.
Do not
- Do not cut the wound or try to suck out the venom.
- Do not apply a tourniquet or ice.
- Do not drink alcohol or caffeine.
- Do not take aspirin or ibuprofen, they can worsen bleeding. Acetaminophen is safer for pain.
- Do not try to catch or kill the snake. A dead snake can still bite by reflex.
First-aid guidance adapted from the U.S. Centers for Disease Control and Prevention (CDC NIOSH), Venomous Snakes. Educational only; always follow the instructions of emergency responders.
More Viperidae snakes
Western RattlesnakeCrotalus oreganus
Western Diamond-backed RattlesnakeCrotalus atrox
Timber RattlesnakeCrotalus horridus
Prairie RattlesnakeCrotalus viridis
Red Diamond RattlesnakeCrotalus ruber
Mojave RattlesnakeCrotalus scutulatus
Western Black-tailed RattlesnakeCrotalus molossus
SidewinderCrotalus cerastes
Classification
How scientists group this snake, from the broadest category down to the exact species. Each step narrows to its closest relatives.
Keep learning
- Are Snakes Dangerous? The Real Risk, in PerspectiveMost snakes are harmless and avoid people. Here is the honest picture of snakebite risk worldwide and how to lower your own.
- Snakebite First Aid: What to Do (and What Never to Do)A clear, CDC-based guide to snakebite first aid: the steps that help, the popular myths that hurt, and how to tell a serious bite from a minor one.
- Venomous vs Nonvenomous: How to Tell the DifferenceThe folk rules for telling venomous snakes apart, where each one fails, and why location-based identification beats guessing by sight.
- What to Do If You Find a SnakeFound a snake at home or on a trail? Here is how to stay calm, give it space, identify it safely, and know when to call a professional.
Distribution from GBIF & iNaturalist. Venom status per CDC. Background: Wikipedia. Informational only. Never handle a snake to identify it.