The Red Admiral is a fairly common butterfly in Ohio, but I've never seen as many at one time as I did yesterday. There were dozens nectaring on our Redbud trees. My field guides say the species occasionally experiences tremendous population outbreaks. It is also one of the few migrating species of butterfly. One of my favorite blogs - Blue jay Barrens - mentioned seeing a similar number of Red Admirals nectaring on his Red bud trees in southern Ohio several weeks ago. Perhaps the mild winter contributed to this population spike.