Okay, this is where it gets really wild. There’s a tiny group of fish called jawless fish. They belong to the class Agnatha. Examples? Lampreys and hagfish—creatures that look more like slimy eels.
They have no jaws, no scales, and a skeleton made of cartilage. They’re basically living fossils, unchanged for almost 500 million years. Imagine if your great-great-great grandpa was still running around looking exactly the same. Bizarre, right?
Hagfish are especially weird. They produce buckets of slime to escape predators. If you’ve ever seen a video of a hagfish turning a bucket of water into goo in seconds, you know it’s equal parts disgusting and awe-inspiring.
