August - October is rattlesnake birthing season. Baby rattlesnakes are born ready to rock, complete with fangs and loaded with venom. They don't have a rattle though, just a "button" ... see one here.
I have come across rattlesnakes in the desert many times and have freaked out. I'm typically pretty calm during a crisis and have been told that I'm the epitome of "grace under pressure". This though ...