フンボルトペンギン
Before the 1982-83 El Niño event, the total number of individuals of Humboldt penguin individuals was estimated to be 20,000. The 1982-83 El Niño phenomenon led to a major decline in the Humboldt penguin population. The combination of an environment changed by human developments as well as the long duration and strong intensity of the event that year led to major effects on the fecundity and survival of the Humboldt penguins. The consequences were a 65% decline in the Humboldt penguin population, migration towards the south and the failure of the 1982 class of hatchlings. The surviving population in 1984 was estimated to be between 2,100 and 3,000 penguins and all were adults.