Long before whales dominated the oceans, Earth’s seas were home to a fish so massive it continues to challenge our ...

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

If you liked this story, share it with other people. Bony fish, or teleosts, represent some 96% of the world’s marine fish species. The IUCN Red List of Threatened Species, the global reference for ...

Newly discovered species of ancient lampreys, eel-like swimmers with sharp suction cups for mouths, are helping scientists reconstruct the evolutionary history of these slithery parasites. Large ...