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Why Some Animals Eat Rocks to Aid in Digestion

animals.howstuffworks.com/animal-facts/gastroliths.htm

Gastroliths, or "stomach stones," are found in animals from chickens to sea lions. But what are they for?

Are zoos good or bad for animals?

animals.howstuffworks.com/animal-facts/zoos-good-or-bad.htm

Are zoos good or bad? You might have asked this while visiting your local wildlife hangout. Learn why zoos are good or bad, depending on perspective.

What Are the World's Smartest Pets and Animals?

animals.howstuffworks.com/animal-facts/smartest-pets.htm

If you think dog and cats are the world's smartest pets, you're right. But there are others too. Which smart animals top the list?

10 Wild Facts About the Aye-Aye, a Most Improbable Animal

animals.howstuffworks.com/endangered-species/aye-aye.htm

This long-fingered primate with the perpetually startled golden eyes is considered one of the most distinctive animals on Earth

The Zoo Hypothesis: Are Aliens Watching Us Like Animals in a Zoo?

science.howstuffworks.com/space/aliens-ufos/zoo-hypothesis.htm

Is it possible that we are not alone in the universe, but are just like animals in a zoo to the aliens who are watching us?

Cloaca: The Single Opening in Animals, Plus Human Implications

health.howstuffworks.com/human-body/parts/cloaca.htm

A cloaca is a single bodily opening in many animals for excretion and reproduction. In rare human cases, failure to separate during development leads to complications.

What Eats Snakes? A Lot of Animals, Including Other Snakes

animals.howstuffworks.com/snakes/what-eats-snakes.htm

While snakes skillfully hunt their prey, they aren’t at the top of the food chain. From birds of prey to larger mammals, there are plenty of animals in the wild that hunt snakes for a tasty meal.

The Blue Whale Is One of the Loudest Animals on Earth

animals.howstuffworks.com/endangered-species/blue-whale.htm

Blue whales are the largest animals in the world. Despite their large size, blue whales manage to be fairly elusive, so there's a lot about them we don't know yet.

Hedgehog vs. Porcupine: Similarly Spiky Animals With Big Differences

animals.howstuffworks.com/mammals/hedgehog-vs-porcupine.htm

When it comes to spiky animals, hedgehog vs. porcupine species seem easy to confuse on paper. At first glance, they seem similar, both covered in sharp quills that help them defend against predators.

What the Stuff?!: 4 Worst Evolutionary Adaptations in the Animal Kingdom

www.howstuffworks.com/videos/what-the-stuff/what-the-stuff-worst-evolutionary-adaptations-video.htm

We have a lot to thank evolution for, but we can't help being a little resentful of the ways it's done us Earthlings wrong.

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