Not really, and you are pretty hard pressed to notice their rattle.
Look over this list and look at the pictures. The range maps are more more of a general guideline, but can give you some hint.
http://www.herpsoftexas.org/category/organismtype/snakes/rattlesnakes
[This message has been edited by ursusguy (edited 4/2/2012 10:26p).]
Look over this list and look at the pictures. The range maps are more more of a general guideline, but can give you some hint.
http://www.herpsoftexas.org/category/organismtype/snakes/rattlesnakes
[This message has been edited by ursusguy (edited 4/2/2012 10:26p).]