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Fifty thousand years ago, North America was home to towering giants. Mammoths roamed the tundra, saber-toothed cats hunted in ...
"Their return will be an important milestone for this ambitious venture." Rangers celebrate after trail cameras capture the ...
The list of 10 most endangered rivers of 2025, according to the nonprofit American Rivers, includes the Mississippi River and the lower Rio Grande.
Many huge animals went extinct surprisingly recently. When they died, their ecological role was lost with them.