Western Diamond-Backed Rattlesnake (Crotalus atrox) lives in desert scrublands across Southwestern North America. Its conservation status is Least Concern.
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Fascinating facts about the Western Diamond-Backed Rattlesnake
Adults regularly reach 120 cm (4 ft), but the longest reliably measured western diamondback stretched to 213 cm (7 ft). Males grow larger than females only after sexual maturity, and the heaviest snakes can tip the scales at 6.7 kg (15 lb). This size makes the species the second-largest rattlesnake in the world, behind only its eastern cousin, and one of the biggest venomous snakes in North America.
A single bite can inject 250-350 mg of venom, with some individuals delivering up to 800 mg. Though its LD50 (2.72 mg/kg IV, 20 mg/kg IM, 18.5 mg/kg SC) is lower than many rattlesnakes, the sheer volume makes envenomation dangerous, with untreated bite mortality between 10 % and 20 %. This combination of high yield and potent hemotoxic effects explains why the western diamondback accounts for most snakebite fatalities in northern Mexico and the greatest number of bites in the United States.
Western diamondbacks can survive up to two years without a single meal. In a 5½-month starvation experiment the snakes cut their energy use by 80 % and even grew skeletal muscle and bone while their body mass shrank, showing they redirect stored lipids to maintain vital structures. This extreme fasting ability lets them endure the harsh desert where prey is scarce.
A 1976 Texas study found that 94.8 % of the western diamondback's diet by weight is made up of small mammals, from pocket gophers to prairie dogs. Larger individuals can even swallow adult cottontail rabbits or jackrabbits, though the latter needs confirmation.
Western diamondbacks thrive in the most human-altered landscapes of the Southwest, deep within Phoenix and Tucson suburbs where they are seen. Their adaptability to semi-urban habitats makes them the most common rattlesnake in homes and the species most often involved in human-snake conflicts, prompting controversial relocation programs.
Sources
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As the sun-baked rocks of the arid landscape tremble beneath its coils, the Western Diamond-Backed Rattlesnake unfurls its majestic form, a dark, sinuous ribbon that weaves through the scrubby underbrush with stealthy precision. With each deliberate movement, the snake's distinctive rattle vibrates the air, a low, ominous hum that serves as a warning to potential threats, a testament to the potent venom that courses through its veins. In this desolate yet beautiful realm, the Western Diamond-Backed Rattlesnake reigns supreme, a master of patience and deception, its ancient, unblinking eyes ever-vigilant for the next unsuspecting meal.
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