Datana Caterpillars

The other day, while looking at plants throughout our friends' Justine and Sean's property, I found a whole bunch of weird caterpillars munching on the leaves of a young sourwood tree (Oxydendrum arboreum). After a bit of searching I have been able to determine that they are members of the Datana moth genus, most likely either yellownecked caterpillars (D. ministra) or contracted datanas (D. contracta). Whichever they are, they were real neat to look at.