10 Things You Didn’t Know About Koalas

Alizada Studios/iStock via Getty Images
Alizada Studios/iStock via Getty Images

Sure, they're cute, and they certainly look cuddly. But here are a few surprising things you might not have known about koalas.

1. Koalas hug trees to keep cool.

Scientists used thermal cameras to watch koalas hanging out in trees. They saw that when the weather was warm, the animals moved to lower parts of the trees and pressed themselves close to the trunks, wedging their butts right into the coolest spots.

2. Koalas exhibit same-sex mating behavior.

In captivity, sexual encounters among koalas have been known to involve up to five females. They last twice as long as female-male encounters.

3. Up to 90 percent of female koalas have chlamydia.

Predators aren’t that important to koala population control, but chlamydia might be. In the late '90s, chlamydia-free koalas were introduced into Mount Eccles National Park in Victoria, which had a huge Manna Gum tree population. Without chlamydia to control the population, koala numbers doubled every few years, and thousands of hectares of forest were at threat until hormonal contraception was introduced. In other areas where chlamydia-free koalas were introduced, the koalas killed the trees and then died of starvation [PDF]. When koalas are stressed, chlamydia—which is normally harmless—limits the population growth. Now, rather than overpopulation, a combination of habitat loss and a retrovirus is making chlamydia a problem even as the population dwindles.

4. Koalas fingerprints are virtually indistinguishable from human ones.

Koala peeking out from a tree
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Koala fingerprints can be mistaken for one another in criminal investigations. The animals' hands are covered in warts.

5. Koalas are extremely picky eaters.

Koalas eat around half a kilogram of eucalyptus leaves a day. They’re very picky, tending to choose around 30 of the 600 varieties of eucalyptus trees out there. Koalas prefer large trees, but avoid those with low protein content and nauseating toxins. The problem is that two trees of the same species right next to each other can have wildly different toxin levels, forcing the koala to rely on their smell. Eucalyptus leaves are very low in calcium, forcing the koalas to go to the ground and eat dirt. They are reported to smell like cough drops because of all that eucalyptus.

6. Koalas sleep a lot.

Because of their diet, koalas have an unusually large cecum—the beginning of the large intestine—to help them digest their diet of eucalyptus leaves. On the other hand, they have tiny brains because brains use a lot of energy and their diets don’t give them much to work with. They can only stay awake for four hours a day.

7. Koala joeys feed on their mother’s "pap."

Koala walking on the ground
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Pap is a kind of soup that forms in a mother koala's cecum and is excreted—so yes, baby koalas eat their mother’s droppings. The stuff is full of microorganisms to get their tiny digestive tracts ready for a lifetime of toxic leaves for lunch.

8. The animal's scientific name, Phascolarctos cinereus, loosely means "ash-gray pocket-bear."

Koalas are not bears, however: They’re marsupials. Their closest living relative is the wombat.

9. The word koala comes from an Aboriginal language.

Koala derives from the Dharug language, which was spoken by the Darug people living in present-day New South Wales, and has also been written as koola, kulla, and kula.

10. Koalas sometimes have white fur.

Though extremely rare, koalas with fur in a color other than gray have been documented. Mick, an incredibly rare white koala with white fur and dark eyes and nose, was treated at the Port Macquarie Koala Hospital in 2007 and released. Albino koalas are white with pink eyes and noses; one was born at the San Diego Zoo in 1985.

Not-So-Fancy Feast: Your Cat Probably Would Eat Your Rotting Corpse

Tycson1/iStock via Getty Images
Tycson1/iStock via Getty Images

Cat enthusiasts often cite the warmth and companionship offered by their pet as reasons why they’re so enamored with them. Despite these and other positive attributes, cat lovers are often confronted with the spurious claim that, while their beloved furry pal might adore them when they’re alive, it won’t hesitate to devour their corpse if they should drop dead.

Though that’s often dismissed as negative cat propaganda spread by dog people, it turns out that it’s probably true. Fluffy might indeed feast on your flesh if you happened to expire.

A horrifying new case study published in the Journal of Forensic Sciences offers the fresh evidence. The paper, first reported by The Washington Post, documents how two cats reacted in the presence of a corpse at Colorado Mesa University’s Forensic Investigation Research Station, or body farm, where the deceased are used to further forensic science for criminal investigations.

The study’s authors did not orchestrate a meeting between cat and corpse. The finding happened by accident: Student and lead author Sara Garcia was scanning surveillance footage of the grounds when she noticed a pair of cats trespassing. The cats, she found, were interested in the flesh of two corpses; they gnawed on human tissue while it was still in the early stages of decomposition, stopping only when the bodies began leaching fluids.

The cats, which were putting away one corpse each, didn’t appear to have a taste for variety, as they both returned to the same corpse virtually every night. The two seemed to prefer the shoulder and arm over other body parts.

This visual evidence joins a litany of reports over the years from medical examiners, who have observed the damage left by both cats and dogs who were trapped in homes with deceased owners and proceeded to eat them. It’s believed pets do this when no other food source is available, though in some cases, eating their human has occurred even with a full food bowl. It’s something to consider the next time your cat gives you an affectionate lick on the arm. Maybe it loves you. Or maybe it has something else in mind.

[h/t The Washington Post]

7 Animals That Appear to Fly (Besides Birds, Bats, and Insects)

renacal1/iStock via Getty Images
renacal1/iStock via Getty Images

The only animals that can truly fly are birds, insects, and bats. Other animals manage to travel through the air by gliding from great heights or leaping from the depths. Here are a few.

1. Devil Rays

The devil rays, in the genus Mobula, are related to manta rays. Their wingspan can grow up to 17 feet wide, making them the second-largest group of rays after the mantas. These muscular fish can leap several feet out of the water, but no one is quite sure why they do it.

2. Colugos

These tree-dwelling gliders are sometimes called flying lemurs, but they're neither true lemurs nor do they fly. These mammals in the genus Cynocephalus are native to Southeast Asia and are about the size of a house cat. Colugos can glide up to 200 feet between trees using their patagium, or flaps of skin between their front and hind legs that extend to their tail and neck (colugos are even webbed between their toes). In the air, they can soar gracefully through the forest, but on the ground, they look like an animated pancake.

3. Flying Fish

Flying fish

There are about 40 different species of flying fish in the family Exocoetidae, although they don't fly so much as they leap from the water with a push of their powerful pectoral fins. Most of the species live in tropical waters. Fish have been observed skipping over the waves for as long as 45 seconds and 650 feet. Scientists suspect that flying fish leap into the air to escape predators.

4. Paradise Tree Snake

The paradise tree snake (Chrysopelea paradisi) lives in the rain forests of Southeast Asia. It glides from the treetops by flattening its body out to maximize surface area, wiggling from side to side to go in the desired direction. Though the idea of a flying snake may be terrifying, C. paradisi is not harmful to humans.

5. Flying Geckos

Flying geckos, a group of gliding lizards in the genus Gekko, live in the wet forests of Southeast Asia. In addition to patagia that let them parachute from tree branches, the geckos have remarkably mutable skin that camouflages them against tree trunks extremely well.

6. Wallace's Flying Frog

Wallace's flying frog (Rhacophorus nigropalmatus) is found in Malaysia and Indonesia. This frog has long webbed toes and a skin flap between its limbs which allows it to parachute—float downward at a steep angle—from the treetops. Although Wallace's flying frogs prefer to live in the forest canopy, they must descend to ground level to mate and lay eggs.

7. Flying Squirrels

Flying squirrels in the subfamily Sciurinae include dozens of species. They are native to North America and Eurasia. When it leaps from a tall tree, a flying squirrel will spread its patagium until it resembles a kite or parachute. The squirrel can steer by moving its wrists and adjusting the tautness of its skin.

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