Sharks live in every ocean in the world, however studies published have shown that up to 70% of oceans are free of sharks.
Sharks are not territorial like most animals are, so they change frequently their habitat. As many other fish, females do not stay to take care of eggs. Young sharks are ready to take care for themselves from the very moment they born. Sharks have succeeded for 420-450 million years because they are extremely good adapting to changing environments, therefore they can change their living area in search for food easily. Regardless sharks are cold blooded, they live either in warm, temperate and cold waters. Some species live mainly in cold waters, while some others prefer warmer waters.
However one thing is for sure, sharks will migrate to find the sources of food and they can travel hundreds of miles to do that.
Most species of sharks are found in the oceans. However, some of them are known to live in bodies of fresh water, like the bull shark which is known to travel up to 4,000 Km up the Amazon River. Sometimes, sharks have been found even in unusual fresh water bodies. This is believed to be caused because the destuction of their habitat by human activity. Either pollution or any other destructive human activity, have provoked that the quick adapting sharks look for food in such unusual places.
Specifically some species like the white shark lives along the U.S. west coast.
The Mako shark habitat is from the US- Mexico border to Washington
The blue shark habitat is from the west coast of Mexico to Canada. Read about Shark Habitat
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