Stock Photo: Adult bull Galapagos sea lion Zalophus wollebaeki posturing on Fernandina Island in the Galapagos Island Archipelago, Ecuador. Adult bull Galapagos sea lion Zalophus wollebaeki posturing on Fernandina Island in the Galapagos Island Archipelago, Ecuador MORE INFO The population of this sea lion fluctuates between 20,000 and 50,000 individuals within the Galapagos, depending on food resources and events such as El Nino