Source: Ultimate Wilderness, pg(s). 198
Giant isopods are carnivorous scavengers that scour the ocean's floor. They vaguely resemble the common woodlouse in appearance, though they can grow to be up to 2-1/2 feet long and weigh nearly 4 pounds. Their unusual size and insectile appearance cause many humanoids to be wary of them, despite their relative harmlessness. They have the unique ability to curl up for defense should they be attacked.