Power up the WHAT IF time machine because today, you’re traveling back to witness the most radical changes ever known in Earth’s history. You’ll watch our planet give birth to strange new animals and ...

Thallium isotopes show O2 levels rose and fell at the ocean floor long after marine animals appeared and diversified half billion years ago, according to study of ancient marine sediments exposed by ...

Animals have been reproducing sexually for hundreds of millions of years, but not always like we do it. When you purchase through links on our site, we may earn an affiliate commission. Here’s how it ...

More than 250,000 animals are hoarded in residences across the United States each year, according to the Animal Humane Society, and they are often left to suffer in horrific conditions. Hundreds are ...