They are each around 40 to 50 centimeters tall. Quokkas are often called “the happiest animal in the world” for their smiling appearance. But they are designated as endangered species.

(CNN) — The story of two of the strangest animals on the planet just got a little stranger, thanks to clues revealed by a lone fossil specimen that scientists now say represents a long-extinct ...

but nothing topped when tennis' biggest stars channeled the "happiest mammal on planet." Players often visit Australia's animal sanctuaries each year during their trip Down Under, and come home ...

We showed that despite covering only 2.4% of the planet's land surface, freshwater habitats host over a third of these fascinating animals. We searched thousands of published articles for mentions ...