red crab grapsus adscensionis of canary

adscensionis animal arthropods beach behavior biodiversity biology canaria canary carapace chelae cliff closeup crab crabs crustacean diving ecosystem environment fauna feeding galapagos gran grapsidae grapsus habitat islands life lightfoot macro marine ocean redlegged reef rocks rocky sally saltwater science scuba sea seaweed shell shore shores snorkeling spain underwater volcanic water wildlife