(CNN) — Tens of millions of years ago, an apex predator resembling a giant crocodile stalked the humid freshwater floodplains of southern Patagonia. Measuring up to 11.5 feet (3.5 meters) long and ...

In a perfect world, we'd still be co-existing with the dodo, woolly mammoth, and quagga, but sadly, these are among the 900+ extinct animal species. Climate change, pollution, and human predation are ...

For the last 10,000 years, thousands of species have perished from the Holocene extinction event, which is still ongoing. Unfortunately, due to human activity, around 150-200 species become extinct ...