Air temp 66*F
Approximately 2.5' in length. 6-8 segments on rattle. Air temperature 75-80 degF. Found among a number of rodent holes. Undoubtedly waiting in ambush when I happened along and disturbed it.
Southern Pacific Rattlesnake on trail, by stream, in shade.
Crotalus is a genus of venomous pit vipers found only in the Americas from southern Canada to northern Argentina. The name is derived from the Greek word krotalon, which means "rattle" or "castanet", and refers to the rattle on the end of the tail which makes this group (genera Crotalus and Sistrurus) so distinctive. 32 species are currently recognized.