I saw one of these for the first time last year on the Pontatoc Ridge Trail - this is the first time that I have seen groups like this - fascinating! Last Year: http://www.flickr.com/photos/cmiles/7992286863/.
Tags: arizona,chelinidea,coronado national forest,pima county,pontatoc canyon trail,pusch ridge wilderness,santa catalina mountains,santa catalina ranger district,vittiger