Northern Pacific rattlesnake, Crotalus viridis oreganus
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Northern Pacific rattlesnake, Crotalus viridis oreganus, in a defensive posture, flicks out its tongue to "taste" the air with its Jacobson's organ. The snake's heat-sensing pit is visible below and in front of the eye. Mount Diablo State Park, California
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animal, California, chaparral, coil, coiled, Contra Costa County, Crotalid, Crotalus, Crotalus viridis, Crotalus viridis oreganus, curve, danger, dangerous, fauna, herpetology, Mount Diablo, Mount Diablo State Park, nature, North America, Northern Pacific rattlesnake, pitviper, poisonous, rattle, rattlesnake, reptile, s curve, San Francisco Bay Area, serpent, snake, tongue, United States, USA, venomous, viper, wildlife
