At that time, jawless fish filled the seas, while jawed vertebrates were uncommon. Today, the opposite is true. Lampreys and ...

Lampreys are another form of ancient, blood-sucking, jawless fish also still in existence today. These findings show that both the hagfish and lamprey evolved their eel-like body form and strange ...

In an era of exploration and discovery, some creatures may be better left alone in the unknown pockets of the planet. Take the hagfish. The slimy, fleshy fish that appears eel-like is straight out ...