When Size Matters: The Planet's Largest Animals

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goliath frog photo
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If you thought that massive creatures disappeared when dinosaurs became extinct, think again: From 1,000-pound snakes to 8-foot tall birds, the giants of the animal world are still all around us.

But for many of them, size doesn't protect them from poaching, habitat loss, and other threats -- which means some of these animals could be our next big extinctions.

Goliath Frog

The Goliath frog is the largest of its kind -- and it's impossible to be unimpressed with its size: The frogs are more than one foot long and weigh as much as 7.2 pounds (which, as the San Diego Zoo points out, is as big as a house cat).

They're also one of the oldest species, since they've survived more than 250 million years on Earth -- though now they're endangered (thanks to poaching and habitat loss) and are even uncommon in U.S. zoos.

Credit: P_Linehan/Creative Commons

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