Clinging along the concrete boardwalk at Punta Suárez is a colony of Sally Lightfoot crabs. Their bright red and orange carapaces shine like beacons against the dark lava rocks. They hold steadfast as waves cascade over their three to five inch shells. As the water retreats, they scurry around while feeding on algae. You might also see them climbing on top of nearby marine iguanas. This is not a hostile move. The crabs make a banquet of the lice on the iguanas.