I just went out to my front yard and snapped these... the first is the "hole" they make and the second is one of the "killers"... there are about 8 or so flying around and I was within a foot of them... NO aggression whatsoever....
I hate losing plants....I know they are "just plants" but when you nurse them along and baby them and get them to grow, bloom, and be pretty and they die....it's like losing a friend.....