Koalas have fingerprints that are 99% similar to humans’—so close that even under a microscope, it’s hard to tell them apart! Scientists believe this might help them grip eucalyptus leaves better. Talk about perfect thief credentials!
Giraffes survive on just 30 minutes of sleep per day, taken in 5-minute power naps. They usually sleep standing up so they can escape quickly if a predator approaches. Imagine functioning on that little rest!
An octopus has one main heart and two backup hearts that pump blood to its gills. But when it swims fast to escape danger, the two gill hearts stop working, making it so exhausted that it can actually die from overexertion!
Penguins look like they have stubby legs, but their knees are tucked inside their bodies under thick feathers. If they straightened their legs, they’d be 20 cm (8 inches) taller!
While lions and tigers roar but can’t purr, house cats purr but can’t roar. Their throat structure is unique among felines, making them the only big cats (relatively speaking) that produce that soothing “brrr” sound.
