Quokka: The Science Behind the Smile
The quokka’s famous “smile” is actually a result of evolutionary adaptation to their herbivorous diet and social nature. Their jaw muscles sit in just the right spots to push their cheeks up into what looks like a happy grin. Their round-cheeked faces match what artists call the golden ratio. That’s the same pattern we see in classic sculptures and baby faces. Quokkas turned out small and bouncy because their island homes don’t have many nutrients in the soil. Plants there grow tough and sparse, so being tiny helps them survive on less food.