Woodcut-style illustration of a Western Diamondback Rattlesnake

Western Diamondback Rattlesnake

Crotalus atrox

Heavy-bodied, diamond-patterned, and equipped with a warning system at the end of its tail. The most widespread rattlesnake in the American Southwest.

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Habitat

Western diamondbacks live across desert flats, rocky canyons, mesquite grasslands, and pine-oak woodlands. They den communally in winter — sometimes dozens of snakes in a single rock crevice — and disperse to hunt in spring.

Behavior

Ambush hunters that strike from cover and follow scent trails to find struck prey. They eat rodents, lizards, and birds. The rattle is a warning, not an attack — a worn-out segment count gives no reliable age, since segments are added with each shed and frequently break off.

Marginalia

  • Rattlesnakes have heat-sensing pits between their eyes and nostrils that detect a mouse's body heat in total darkness.
  • The "rattle" is made of interlocking keratin segments — the same protein in human hair.
  • Newborn rattlesnakes are venomous from the moment they leave the egg sac.
  • Diamondbacks account for more snakebite fatalities in the U.S. than any other species.

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