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The vast majority of tardigrada feed only on plant cells or bacteria, slicing them open and drinking their fluid contents. A few other species in tropical reefs even "farm" food from bacterial colonies in specialized cranial cavities. Some water bears, however, are a little less snuggly...

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Yeah, he's a right softy.

It's obvious why the tardigrade is the HARDEST animal: Fossils of tardigrades have been dated to the Cambrian period over 500 million years ago. They have eight legs, with ferocious claws resembling those of great bears. Their mouth is also a serious weapon, with dagger-like teeth that can...