Please Help ID this living poop.

[Swamper]

I don't know what else to call this. I was out looking for macro shots to take because another thread on here inspired me when this thing caught my eye. I thought it was a bird dropping on my tangelo shrub/tree that I have in a pot. I have noticed this past week that something has been eating it's leaves possibly a hopper of some sort. Anyway I was thinking what a strange dropping when it moved and I was like NO FREAKIN WAY what is that eating all my leaves. I was going to squash it but as I started snapping pictures, I saw eyes, mouth, legs and figured maybe I shouldn't kill it without at least finding out what it is. It looks like a snake/caterpillar but I don't know much about caterpillars unless it's an engine. ANyway can someone please help?