King penguins are the 2nd-largest penguin, behind emperor penguins. King penguins mainly eat small fish.
King penguins occupy Southern Ocean islands en masse during mating season. One island colony hosted over 1/2 million breeding pairs in 1988. In 35 years, that king penguin colony population plummeted 88%. Nearly 1/3rd of the world’s king penguins disappeared in the collapse, which continues. Researchers do not know why king penguins are disappearing.