The viruses that have been infecting mammals for 105 million years

Not Exactly Rocket Science
By Ed Yong
Sep 18, 2009 7:00 PMNov 5, 2019 12:12 AM

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The two-toed sloth is a walking hotel. The animal is so inactive that its fur acts as an ecosystem in its own right, hosting a wide variety of algae and insects. But the sloth has another surprise passenger hitching a ride inside its body, one that has stayed with it for up to 55 million years - a virus.

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