There are more than a hundred species of crabs in the Galapagos, but one stands out from the rest. The Sally Lightfoot, or red lava crab, (Grapsus grapsus), is probably the most representative crustacean of the Galapagos shorelines. It is so abundant and so brightly colored, with red on its back and blue on its undersides, that no one could miss them. Their name comes from their habitat of skipping across short stretches of water. There is another version of the story -- that they were named after a Jamaican dancer, Sally, who wore red shoes when dancing on the tables.