Despite their flashy eyeliner and rockstar highlights, Yellow-eyed Penguins have no interest in taking center stage. At just two feet tall, these evasive little waddlers are some of the shyest and most elusive penguins in the world. In fact, they love their privacy so much they even go out of their way to build nests away from other penguins. While they may not seek the fame and glory of their marching cousin, the Emperor Penguin, they’re no less adorable—or in danger of disappearing. Most penguins spend their days hopping on and off of ice floes. Yellow-eyed Penguins, however, prefer the beaches of New Zealand’s South Island where they spend their days covertly feeding on krill, fish, and shrimp before scampering up the sandy shores to hunker down—incognito, of course—in dense coastal forests and shrubland for the night. Unfortunately, their affinity for a forested, beachside lifestyle has left New Zealand’s rarest penguins exposed to a host of threats on land and...