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(image credit: Sue Hickton)


- A shark does not have one bone in its body. Its skeleton is made up of cartilage. Cartilage is a tough material, like the material that shapes your ear.
- The Swell Shark, found in New Zealand, barks like a dog.
- Weird things have been found inside a shark, such as a bottle of wine, a treasure chest, a suit of armor, a drum and a torpedo.
- A shark’s skin is covered with denticles, which are small, razor-sharp teeth.






Such images lend themselves very well to Photoshop:




These sharks have reputation as vicious predators, yet they are not unsystematic "eating machines". They attack from below in order to investigate what is floating on the surface.



(image via)





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(image credit: David Doubilet, National Geographic)

Great white sharks not only swim, they FLY!









See more pictures of the amazing hunt of great white sharks for seals in False Bay here.





(image credit: Eric Cheng)

This is definitely going to increase your confidence at sea: the enormous monster breaching the waves and flying at you with bloody dripping jaws. OK, it may not happen with such vivid color, but still....




(image credit: Lars-Gunnar Svard)

The Tiger shark is the fourth largest predatory shark. This shark is a solitary hunter, usually hunting at night. Its name is derivative from the dark stripes down its body, which grow fainter as the shark matures. It is infamous for attacks on swimmers, divers and surfers in Hawaii and is often referred to as "the wastebasket of the sea".





(image credit: Lars Kirchhoff)

Make way! The Boss is coming -




(image credit: Christie Fisher)

The tiger shark with a little "afternoon snack" -





(image credit: Christie Fisher)

Bull sharks often cruise through shallow waters and can suddenly burst into speed and can be highly aggressive. They are extremely territorial and will attack other animals and humans that enter their territory. Bull sharks are among the four species considered to be most dangerous to humans.








(images by wiki and Joe)

Here is a bit more aggressive photography:







(images via)

The first image shows the Shortfin Mako shark, one of the species that's officially responsible for eight unprovoked attacks on humans with two ending in fatality and twenty boat attacks.

In terms of size though, even the largest shark found on Earth today looks simply microscopic, compared to the size of prehistoric monsters, such as this Liopleurodon:




(image credit: Mark Witton)

Note that close to Liopleurodon's mouth is not a shark, but a huge plesiosaur, in itself the size of medium boat.

A few amazing facts about sharks: - via

- A shark does not have one bone in its body. Its skeleton is made up of cartilage. Cartilage is a tough material, like the material that shapes your ear.
- The Swell Shark, found in New Zealand, barks like a dog.
- Weird things have been found inside a shark, such as a bottle of wine, a treasure chest, a suit of armor, a drum and a torpedo.
- A shark’s skin is covered with denticles, which are small, razor-sharp teeth.

Not all huge sharks live in the warm or tropical waters. There is a shark species (still in many ways a mystery to biologists) that lives deep in the Artic water - sometimes as deep as 600 meters:

Greenland Sharks Lurk Beneath the Arctic Ice

The sleeper shark.... the "gurry" shark: the largest of Greenland sharks are comparable in size with the great white shark, although there is no record of them ever attacking humans. Check out these teeth though: small but razor-sharp -




(images by Nick Caloyianis National Geographic, and Canadian Shark Research Lab)

"Forget the cold. I kicked my fins and swam toward the shadowy figure. It turned and began moving toward me. I was face-to-face with a Greenland shark. I’d seen drawings and paintings of the fish, but this was utterly different. It was ghoulish. Its nostrils were the largest I had ever seen on a shark. They reminded me of a giant double-barreled shotgun. Its mouth was slightly open, revealing rows of small sharp teeth. Its eyes looked fogged over, like those of a dead fish, and from each one dangled a tasseled parasite." (Nick Caloyianis)

These guys are nearly blind, but they have a mouth big enough to eat a full-grown seal as some kind of muffin. There are also stories of these sharks attacking caribou as they drink from the mouths of rivers... and eating polar bears. So here you go.