Swallow-tailed gull, sleeping beneath a lava outcrop, opens its eye to check out a passing tour group Creagrus furcatus, formerly known as Larus furcatus This equatorial seabird is endemic to the Galapagos Islands and the only species of gull that

Swallow-tailed gull, sleeping beneath a lava outcrop, opens its eye to check out a passing tour group, Creagrus furcatus, formerly known as Larus furcatus, This equatorial seabird is endemic to the Galapagos Islands and the only species of gull that feeds at night, North Seymour Island, Galapagos Archipelago, Ecuador, (Photo by Wild Horizons/Universal Images Group via Getty Images)