A frozen wolf discovered in Siberia turned out to be 44,000 years old. It's so well-preserved that scientists are checking its gut for ancient viruses.

It's the only complete adult Pleistocene wolf that's ever been found, so that in itself is really remarkable and completely unique.

Living bacteria can survive for thousands of years, which are a kind of witnesses of those ancient times.

The wolf's stomach may hold its last meal and much more.

Studying the animal's genome will help reveal where it fits into the canine family tree.

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