Adult swallow-tailed gull (Creagrus furcatus) on Espanola Island in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

creagrus furcatus espanola island galapagos islands ecuador birdwatching wildlife seabird coastal habitat avian life nature shorebird ecology marine environment island ecosystem feathers red eyes tropical conservation animal behavior native species coastal rock nesting feeding migration biodiversity south america ocean natural habitat fauna adult gull resting shore cliff environment ornithology galapagos fauna endemic species bird identification ecology research island biodiversity coastal ecology environmental science animal observation