00:00These fish have scales so tough, you can't even break through them with an axe.
00:04The first armored tank lives in the Amazon.
00:06It's the arapaima, a giant fish that weighs nearly 200 pounds and can grow up to 13 feet long.
00:12Its scales are so strong that neither piranhas nor crocodiles can bite through them, and it can even breathe air.
00:19It lives up to 50 years with no problem.
00:21Its incredibly tough scales are actually being studied to make bulletproof vests.
00:25Each scale is up to 5 inches long and made of two overlapping layers, making them 10 times stronger than
00:32bone.
00:32For now, they're mostly using arapaima scales to harvest collagen for cosmetics.
00:37The second river dinosaur lives in the rivers of North America, the alligator gar.
00:42It's a living fossil that's been swimming around for over 100 million years.
00:46Its body is covered in ganoid scales, like super hard enamel shaped into diamonds.
00:51Predator's teeth just slide right off them.
00:54Try to break through, and you'll see sparks fly.
00:57This fish can grow up to 10 feet long and has teeth that look a lot like a shark's.
01:01So what do you think?
01:02Could their scales actually make a real bulletproof vest?
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