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10 of the biggest animals to roam the planet

By: Katherine Butler on May 20, 2011, 12:25 p.m.
An illustration of a Carcharodon megalodon.

Photo: Mary Parrish/Wikimedia Commons

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Going to need a bigger boat

Humans think of themselves as the most important creatures ever to walk the planet. But when it comes to size, humans are mere peanuts next to ballpark-sized animals. Here's a snapshot — you never know what a paleontologist will dig up — of some of the biggest animals that have walked our planet, present and past.

Pictured here is the megalodon, also known as Carcharodon megalodon. This creature was a 52-foot shark with jaws big enough to swallow a rhinoceros. It lived about 25 to 1.5 million years ago. Some believers think it may still lurk in our deepest oceans today, though there is no proof of this.