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Armadillidium
http://en.wikipedia.org/wiki/Woodlouse
I feel like Martha's Vineyard might have the largest concentration of these guys.. they are everywhere!!
Hi Danielle, nice find! This looks to be a Sowbug, rather than a Pillbug (also called Woodlouse). These guys are a bit more flat and are unable to roll up in a ball, but they do live in similar habitats to the Pillbugs. Please take a look at the link I provided and compare with your picture. Here is a link to one of the more common Pillbug species so you can see the differences: http://bugguide.net/node/view/94180