This is the caterpillar of the Yellow-collared Scape Moth. The adult moths are abundant throughout our area in late summer and fall. I have seen several of the caterpillars feeding on spike-rush at Oakes Quarry in Fairborn. 

This is a Clear Dagger moth caterpillar. Note the yellow markings on the top of its head. I found this caterpillar waiting on my doorstep when I got home from the store one day. 

This is a Hag Moth caterpillar, also known as a "Monkey Slug". These caterpillars wave their "arms" like an octopus when moving. This is another one of the stinging caterpillars you want to avoid touching. Photographed at Twin Creek MetroPark.