During the fourth week of August 2007 a mother Blacktailed Rattlesnake with about five babies was discovered in an opening under a large boulder at Boyce Thompson Arboretum. I'd stop by and look whenever I passed by and see if she was still there. The family was there all week, but on the morning of August eighteenth they were gone. The Friday before, a rock squirrel was sighted putting on quite a show in front of the boulder, throwing dirt, scratching the ground and kind of just looking like he was showing Mama snake how tough he was. Mama snake had her tail rattling and was keeping an eye on the sassy squirrel, but nothing happened between the two, but there have been times when Arboretum staff have seen Rock squirrels going at a snake, even killing it. Visitors and staff have also seen a rock squirrel threatening a Gila monster. Tough little guys!