sharks – Page 26

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Blue sharks have been known to dive further than 1800 ft (548 m) deep to temperatures as cold as 45°F (7°C).

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Young dusky sharks may fall prey to larger sharks; however, mature dusky sharks have few if any predators.

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Only one specimen of a sailback houndshark has been found, at a depth of 73 m off northern Papua New Guinea.

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There is only one record of a leopard shark harassing a human. It was in 1955 and no injury occurred.

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The black tips on a blacktip shark’s fins tend to fade with age. The anal fin usually doesn’t have a black tip.

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Nurse sharks’ small mouths may limit the size of their prey, but they can shake their head violently and/or exhibit a suck-and-spit behavior to reduce its size.

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Shark conservation efforts can be inhibited by a lack of international cooperation. For example, blue sharks are harvested by at least 25 countries, all of whom would need to work together in order to reduce the sharks’ chance of extinction.