Expensive Dental Bills
The average shark has 40-45 teeth and can have up to seven rows of replacement teeth. Because sharks lose a lot of teeth and grow them back quickly, they often go through more than 30,000 teeth in a lifetime.
Bad to the Bone
Sharks today don’t have bones. Their skeletons are made of cartilage. Subsequently, this makes it harder to study their fossils, but paleontologists believe they found an earlier ancestor to sharks that actually did have bones once.
Hammerhead sharks are born with soft heads so they won’t jam their mothers’ birth canals.
Not Your Mama’s Cookies
The Cookiecutter shark’s name stemmed from its unusual feeding method. The sharks attach its mouth onto its victim and carve out a hunk of flesh, leaving a circular wound in its prey that resembles the hole a pastry cutter forms in dough.
Survival of the Fittest
The first tiger shark pup to hatch inside its mother’s womb devours its unborn siblings until only two pups remain, one on each side of the womb.