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Sharks have adapted to living in a wide range of aquatic habitats at various temperatures. 
Some species, like the bull shark, are even known to swim in salt, fresh and brackish waters
Most
sharks are especially active in the evening and night when they hunt.
Some sharks migrate over great distances to feed and breed
This can take them over entire ocean basins
.
While some shark species are solitary, others display social behavior at various levels.
