Animal Facts

Learn about some of the strange and unusual facts and terms in the animal kingdom.


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Do Animals Have Different Blood Types Too?

Do non-human animals have equivalent categories to our A, B and O blood designations? Can animals donate blood?

How the Beagle Brigade Works

The Beagle Brigade is an important part of U.S. Customs and Border Protection. The dogs are trained to sniff out fruits, foods and plants in international passengers' luggage as they arrive in the airport terminals.

Can Animals Experience Culture Shock, Too?

Twins pandas born at Zoo Atlanta were sent to China and are reportedly having a hard time adjusting. But is that culture shock or something else?

Can Animals Get Sunburned?

Whether through biology or behavior, nonhuman animals have to avoid sun damage just like we do.

Pets Satisfy Kids More Than Their Siblings Do, Study Suggests

Pets might have more to do with a child's psychological well-being than previously thought, and moreso than even their brothers and sisters.

These Awesome Animals Got Celebrity Names in 2016

From musicians to politicians, a bunch of famous folks can now say they have entire species named in their honor.

Tardigrade Mating Finally Caught on Camera, Is Suitably Weird

The toughest animal in the world has just released its first sex tape, and as with all things water bear, things get pretty freaky.

Hypnotic, Interactive Map Predicts Migration as Animals Become Climate Refugees

A new tool helps visualize how a changing climate will force animal species to relocate.

10 Animals That Look Like Monsters

There's little we can imagine that Mother Nature hasn't already dreamed up in one of her fouler moods. Care to meet some creatures with frightful features?

5 Reasons Tardigrades Will Outlast Us All

There's no way humans will outlive the tardigrade, but we might be able to steal some of its powers while we have the chance.

There Are Multiple Theories for Why Dogs Tilt Their Heads

If you think there's one easy explanation behind this cute canine behavior, think again.

Your Dog or Cat Can Have Depression, Too

But how do you diagnose a pet's mental state when it can't talk to you?

10 Animals With Better Jobs Than You

Hate to say it, but some animals have jobs that are far more interesting — and more lucrative — than yours. Who are these lucky dogs?

Gaze Into the Disappearing Mouth of the Hydra

The Hydra is a fearsome, tiny predator that stings and swallows its prey — through a mouth it had to rip its own skin to create. But how does it do that?

New Study: Fear Alone, Replacing Actual Predators, Can Change Ecosystems

The only thing we have to fear is fear itself, said FDR, but he wasn't a biologist. Scientists examined what impact the fear of apex predators can have on an ecosystem.

Feeling Sick? Snuggling With Pets Won't Hurt Them, Could Help You

Don't worry about transmitting the cold or flu to your furry friends. In fact, some time cuddled up can help with your sickness.

Should Other Animals Have the Same Rights (and Responsibilities) As Humans?

Will we witness personhood for other animals in our lifetime? It's not out of the question, thanks to a recent court decision.

9 Times Interspecies Friendship Worked Out OK

In times of strife and conflict, it's good to remember that differences are OK. Here's a dose of adorable: nine interspecies interactions that didn't end up in a meal.

10 Weird Ways Organisms Reproduce

No matter what your imagination can cook up, real life is weirder. Whether it's parasitic wasps or super-controlling ferns, reproduction can be mysterious, gross or even scary.

Did a Russian lake flash-freeze a herd of horses?

Picture a herd of hundreds of horses fleeing a burning forest and running headlong into a wintery lake, which quickly flash-freezes the whole lot of them. Sounds pretty gruesome — and flat-out unbelievable. But did it actually happen? Could it?

Do animals laugh?

Researchers have investigated whether animals are capable of making a unique sound in response to joy.

What's the largest land animal of all time?

Just how big do animals come? Dive backward through time and the fossil record in search of the most colossal member of kingdom Animalia.

How Animal Imprinting Works

Ever wonder why some birds end up following a mother of another species? It has a lot to do with who (or what) is around when they hatch. So maybe keep your distance the next time you spot a nest.

HowStuffWorks: Zoo Atlanta’s New Slimy, Scaly Spectacular

Join HowStuffWork's Robert Lamb as he visits Zoo Atlanta's new Scaly Slimy Spectacular home for reptiles and amphibians.

10 Insects We Love to Study

They're found in stupendous numbers, they don't take up much lab space and they have an awful lot to teach us about the world and its residents. Meet 10 of the insects we just can't stop studying.