There's little evidence that military policing in Colombia improves public safety, research finds.

European colonial forces targeted an Indigenous group in Uruguay, the Charrúa, for elimination. Now, ancient DNA offers a link back.

Researchers thought Pacific and Caribbean crocodile populations in Panama would be different species. Their genes tell a different story, one about the Ice Age.

"The carapace of some Stupendemys individuals reached almost three meters, making it one of the largest, if not the largest turtle that ever existed."

About 7 to 6 million years ago, the the Hadley circulation intensified, changing the mammals of South America.