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Coiled Prairie Rattlesnake
Photograph by Chris Johns
This prairie rattlesnake is poised to strike. Adult rattlesnakes, unlike juveniles, are able to regulate the amount of venom in their bites.
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Prairie Rattlesnake
Photograph by Chris Johns
Rattlesnakes add a segment to their iconic rattles each time they molt.
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Mojave Rattler Curled on Rocks
Photograph by Bates Littlehales
Rattlesnake venom is extremely potent, containing hemotoxins and sometimes neurotoxins.
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Western Diamondback Rattler at Rest
Photograph by Bates Littlehales
Small mammals, birds, and other reptiles are the preferred food of western diamondback rattlesnakes. In leaner times, the snake is able to go without eating for long periods (up to two years), reducing its activity and making it rely on fat reserves for energy.
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Coiled Western Diamondback Rattler
Photograph by Bates Littlehales
Western diamondbacks are among the most aggressive species of rattlesnakes and have a striking distance up to 66 percent of their body length. They do not shy away from confrontation, and their bites have been the cause of several recorded deaths.
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Western Massasauga Rattlesnake
Photograph by Bates Littlehales
The western Massasauga rattlesnake is one of the smaller rattlers. Compared to other larger rattlesnakes, its venom is more toxic, but it delivers less venom per bite.
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Sidewinder in the Sand
Photograph by Bruce Dale
Sidewinders move by pushing off the ground from two places and throwing their necks forward. The tracks they leave behind look like the letter "J," with the bottom of the "J" indicating the direction the snake was traveling.
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National Geographic Magazine
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The Beauty of Insect Eggs
Engineered for survival, insect eggs hang on and hatch wherever their parents deposit them.
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Eels Photo Gallery
The freshwater eel is one of the few fishes to spawn in the ocean and spend its adulthood in lakes, rivers, and estuaries.
