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How Do Snails Get Their Shells?

animals.howstuffworks.com/marine-life/do-snails-get-shells.htm

Snails can't survive without the protective shells they call home. Get the details on how they grow them at HowStuffWorks.

How Megalodon Worked

animals.howstuffworks.com/extinct-animals/megalodon.htm

The megalodon was born as big as an adult great white and grew to weigh as much as 7 Tyrannosaurus rex. Learn all about the megalodon.

The Titanosaur Family Was the Largest to Ever Roam Earth

animals.howstuffworks.com/dinosaurs/titanosaur.htm

That's the titanosaur, one of the largest land animals to ever exist, dwarfing nearly everything around it. Roaming the planet during the Late Cretaceous period — approximately 100 million years ago — titanosaurs are part of a family of sauropod dinosaurs known for their massive size, long necks and incredible diversity.

A Greenland Shark Living Today Could Have Been Alive in 1620

animals.howstuffworks.com/fish/sharks/greenland-shark.htm

This denizen of the frigid deep not only lives a crazy long life, it also can grow up to 24 feet in length and eating its flesh can make humans "shark drunk."

Scary Prehistoric 'Hell Pigs' Once Roamed the Earth

animals.howstuffworks.com/extinct-animals/prehistoric-hell-pigs-once-roamed-earth.htm

These super-frightening entelodonts (aka hell pigs) once patrolled throughout Eurasia, North America and Africa.

How Snakes Work

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Snakes are one of the world's most feared animals. Learn how snakes get around, how they kill and eat their prey, and how they court and reproduce.

Can a Turtle Outgrow Its Shell?

animals.howstuffworks.com/reptiles/turtle-shell.htm

Turtle shells help protect the reptiles from predators and allow some to move quickly through the water. Find out if a turtle can outgrow its shell.

How Do Airline Pilots Know Turbulence Is Coming Up?

science.howstuffworks.com/transport/flight/modern/airline-pilots-predict-turbulence.htm

Predicting turbulence isn't an exact science, but airline pilots use a variety of tools both high-tech and low before asking you to buckle up.

What's the Largest Land Animal That Ever Existed on Earth?

animals.howstuffworks.com/animal-facts/largest-land-animal-all-time.htm

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

What's the Difference Between a Mountain Lion and a Cougar?

animals.howstuffworks.com/mammals/cougar-vs-mountain-lion.htm

Puma, panther, mountain cat, mountain lion, mountain screamer, painter, catamount and, yes, cougar. This cat has a lot of names!

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