You may see only the northern half of the globe crab, tucked into the seabed. If hiding doesn't fool its predators, the crab can flee: scuttling this way, then that, to lead its pursuer on a merry chase.
Used motor oil poured down the drain or on the ground winds up in rivers, lakes, and the ocean. Each year, Americans illegally dispose of 220 million gallons of oil—twenty times the Exxon Valdez spill. The solution? Recycle the oil—it can be re-refined and reused.
All crabs must shed their shells (exoskeletons) in order to grow. After the crab struggles free of its old exoskeleton, it is vulnerable for several days while its new, soft shell hardens into protective armor.