My climbing partner mistakenly left my green alien on the 5.9 (3rd) pitch of the lower North Ridge of Mt. Stuart on July 15.  I guess he thought that since there was a stuck green alien on the 2nd pitch, all green aliens were stuck (although I'm not sure what he thought about the carabiner on it).  By the time I realized it was missing, we were past the notch.  It should not have been stuck and should have come right out.  It has pink tape on it.