1. Koi Can Live More Than 30 Years Koi carp are one of the most beautiful pet fish species. Owners usually keep them in ponds instead of aquariums because of their large size. Koi fish can also ...

In a river of northeastern Brazil, an “armored” creature with “large” eyes paused to rest against a rock. The maze-like ...

Photo from Getty / iStockphoto In a river of northeastern Brazil, an “armored” creature with “large” eyes ... popular aquarium pets for decades. Looking at the fish in a laboratory ...