The quokka, a small marsupial native to Australia, is often called the “happiest animal in the world” thanks to its irresistibly smiley expression. Found mostly on Rottnest Island, these herbivores are known for their friendly, curious nature and their surprising comfort around humans. Their playful antics and naturally cheerful look have made them a favorite among tourists and photographers alike. While their “smile” is just a quirk of their facial structure, it has helped turn them into global