You may have come across eel-like hagfishes from the few times they have gone viral on the internet, but they might be even more unusual than the videos and photos suggest. While some might describe a ...

Lampreys are another form of ancient, blood-sucking, jawless fish also still in existence today ... When being hunted in the sea, they can instantly turn the water around them into a cloud of slime, ...

As for iridescence, river catfish have no scales, but their delicate skin is covered with a protective layer of slime that gives them a shiny glow. These fish are threatened with habitat ...