PBS
When Giant Scorpions Swarmed the Seas
Sea scorpions thrived for 200 million years, coming in a wide variety of shapes and sizes. Over time, they developed a number of adaptations--from crushing claws to flattened tails for swimming. And some of them adapted by getting so big...
PBS
When Fish Wore Armor
420 million years ago, some fish were more medieval. They wore armor, sometimes made of big plates, and sometimes made of interlocking scales. But that armor may actually have served a totally different purpose, one that many animals...
Bizarre Beasts
This Slimy Fish Ties Itself in Knots
Hagfish are slimy sea noodles that wear their skin like a pair of loose pajamas... and that isn't the weirdest thing about them.