During mating season, male African penguins produce a loud, distinctive song similar to a donkey’s bray, giving them their nickname “jackass penguins.” #NatGeoExplorer David Reby hypothesizes longer vocalizations are meant to show off stronger respiratory capacity, reflecting superior diving and foraging ability, to attract mates. His team recorded and analyzed male penguins’ songs and dives to test their theory and illuminate the iconic call of this endangered species. The National Geographic S