4. Quokka (Australia, Oceania)
Australian wildlife is represented in our rankings by multiple species, starting with the quokka. It’s no surprise that the quokka makes the top five, starting with the fact their facial structure gives the appearance of a constant smile, and helping it earn the nickname of "world's happiest animal".
Quokkas are also known for their friendly and photogenic nature. Though they have adapted to a life in dense bushes and forests, they are more than happy to snap a picture with humans they encounter, truly capturing the essence of joy in the animal kingdom.