“As Pesto sheds his juvenile feathers and develops his sleek, waterproof adult plumage, he’s beginning to look more like an adult king penguin and is almost ready to dive into the next stage of life as part of the colony,” a rep for the Sea Life Melbourne Aquarium shares with TODAY.com.

Pesto, the avian answer to the viral hippo Moo Deng, has started to molt. The chick, who lives at Australia’s SEA Life Melbourne Aquarium, has started to fledge. In a kind of bird puberty, Pesto is losing his baby feathers and adult feathers are taking their place.

Pesto the massive king penguin chick has begun his molting process, losing the fluffy brown feathers which defined his look adored the world over on social media.

Pesto the penguin, who lives at the Sea Life Aquarium in Melbourne, Australia, became a viral sensation for his ginormous size as a baby.