I took a photo of this caterpillar awhile back and happened to come upon it again today. Does anyone know what kind of caterpillar it is? What it will eventually turn into and why it has "spikes" down it's back? I don't know why, but I am in LOVE with this picture...I don't know how I did it, but it looks really neat to me for some reason? The two biggest "spikes" didn't move like antenna, so...any ideas what the purpose is?