An adult Galápagos sea lion sits upright on a rocky beach as waves crash in the background on North Seymour Island, near Santa Cruz in the Galápagos Islands, Ecuador

galapagos sea lion sea lion zalophus wollebaeki glapagos galapagos islands seymour island north seymour north seymour island santa cruz santa cruz island ecuador bbc marine mammal endangered endangered species conservation darwin charles darwin ocean sea flippers whiskers flipper boulders shore seal skin seal glossy wildlife nature endemic rocky shore rocks marine sleeping lobo marino breeding sexual dimorphism fur pup pups prey streamlined playing inquisitive waves lapping coat crab