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Prehistoric art

Controversial rock art may depict extinct giants of the ice age

More than 12,000 years ago, South America was teeming with an astonishing array of ice age beasts — giant ground sloths the size of a car, elephantine herbivores and a deerlike animal with an elongated snout.

These extinct giants are among many animals immortalized in an 8-mile-long (13-kilometer-long) frieze of rock paintings at Serranía de la Lindosa in the Colombian Amazon rainforest — art created by some of the earliest humans to live in the region, according to a new study.

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An extinct rat shows CRISPR’s limits for resurrecting species

Before the early 1900s, if it walked like a Christmas Island rat and talked like a Christmas Island rat, it probably was a Christmas Island rat. But if one of these now-extinct rats ever walks the Earth again, it will actually be a genetically modified Norway brown rat. And the rodent won’t be as similar to the Christmas Island rat as some would hope, a new study finds

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