A penguin scientist makes an astonishing discovery: interspecies mating between a Macaroni Penguin and a Rockhopper Penguin. This is an incredibly rare sighting in the wild, defying typical penguin behavior. What brought the two penguins together? Secrets of the Penguins is now streaming on @disneyplus and @hulu https://on.natgeo.com/4cHzyFv Explore the World with National Geographic subscriptions: http://natgeo.com/ytngmagazine ➡ Subscribe: http://bit.ly/NatGeoSubscribe And check out more