News Main Animals Archaeology Dinosaurs Earth History Human Animal Space Tech   James W. Hagadorn |   Early Tracks Researchers estimate the tracks found on Elk Mound sandstone in Wisconsin were left by an arthropod that scurried along using between 6 and 13 pairs of legs. The ancient arthropod likely used a shell, but differed from today's hermit crabs in one major way -- it was too small for the animal to retreat fully inside. Instead, the shell served to protect the creature's gills, keeping them moist while it spent hours scavenging among the tidal flats.| Discovery News Video   « back to article

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