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Rattlesnakes are found from southern Canada to central Argentina but are most abundant and

diverse in the deserts of the southwestern United States and northern Mexico. Adults usually vary

in length from 0.5 to 2 metres but some can grow to 2.5 metres. Most rattlesnakes are blotched with

dark diamonds, hexagons, or rhombuses on a lighter background, usually grey or light brown.

The most common species in North America are the timber rattlesnake Rattlesnakes are not

aggressive and will not attack humans if unprovoked and they are quite shy and timid. Like other

reptiles, rattlesnakes cannot tolerate extreme heat or cold. During the heat of the day, rattlesnakes

hide underground in burrows or under rocks. Rattlesnakes eat mostly rodents, but may also eat

insects and other reptiles. Rattlesnakes are pit vipers, so they have heat-sensing organs located

in pits near the eyes. Although rattlesnakes may seem scary to people, they play a very

important role in their ecosystems by controlling small mammal populations.

Fun Facts RATTLESNAKES
  • Rattlesnake Rattles Are Made From Keratin

  • They Add a Rattle Segment Each Time They Shed

  • There Are More Species in Arizona Than Anywhere Else.

  • They “Hear” by Sensing Vibrations

  • Deadly Rattlesnake Bites Are Rare.

  • Their Fangs Have Hinges.

  • Rattlesnake Eyes Have Vertical Pupils.