Add Yahoo as a preferred source to see more of our stories on Google. Thousands of fish species — about 2,500 of them named — call the Amazon River home, but scientists estimate nearly half of the ...

Species numbers alone do not fully capture how ecosystems are changing. In a global study, scientists analyzed long-term data ...

Ancient fish, known as living fossils, have survived for millions of years. Species like Coelacanth, Sturgeon, Lungfish, Lamprey, Hagfish, Gar, and Paddlefish offer a glimpse into prehistoric life.

Sign up for CNN’s Wonder Theory science newsletter. Explore the universe with news on fascinating discoveries, scientific advancements and more. Paleontologists ...