King penguins live in the Southern Ocean, nesting on the islands there. They demonstrate different behavior when nesting and not, and at different stages of their life. They have been tracked from the early 1990s using Argos by CEBC/CNRS team, from Crozet Islands, South of the Indian Ocean.
Parents are taking care each in turn of the egg and then the chick. The parent not baby-sitting leaves for about three weeks to feed in the Polar Front and back, keeping in its stomachs the small fish and other prey. Once back on the island, the other parent leaves, and the one who just came back feeds the chick with the content of its stomach. But during their stay on the island, they are not feeding themselves, and they can keep the chick fed from their foraging trip only so long. So they need very efficient foraging strategies to keep going.
Adult king penguin tracks overlaid on micronekton epipelagic layer (the topmost one) (Credits CEBC/CNRS for the penguin tracks, CLS/MESOPP for micronekton data, Seapodym model)