10 facts about sharks.
1. Sharks are the most terrible predators of the seas. There are 375 described species of sharks.
2. The great white, tiger, oceanic whitetip and bull sharks have been involved in a significant number of fatal, unprovoked attacks on humans.
3. Sharks have especially thin sense of smell. They feel one part of blood of an animal in 100 million parts of water.
4. Sharks have a sharp sense of hearing. They can hear prey many miles away.
5. Sharks have a skeleton consisting of an elastic cartilage.
6. The biggest fish in the world is whale sharks. It is reaching 15 meters in length and mass exceeding 10 tones.
7. Teeth are the main weapon of a shark. They are powerful enough to bite through sheet steel. Loading on teeth at sharks is so great, that they should have 3-4 additional of some teeth.
8. Sharks are some of the world’s most misunderstood predators, as they very rarely attack humans unless intimidated.
9. The number of shark attacks on humans worldwide each year about 50 to 70, but the number of those proving deadly no more than 5 - 10.
10. Sharks swim at an average speed of 8 km/h, but when attacking, the average shark can reach speeds upwards of 19 km/h. The shortfin mako is considered to be the fastest shark. It may range upwards of 50 km/h and. The great white shark is also capable of considerable bursts of speed.
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