Is a dolphin faster at swimming than a shark?
We have some observations on the speed of dolphins because they often swim close to the surface and like to swim alongside ships for long periods. Then their speed can be measured from the ship's speed. It seems that several different kinds of dolphins can swim at speeds up to twenty-four miles per hour for periods of ten to thirty minutes.
We do not have the same kinds of measurements for sharks. A blue shark was studied while swimming against a current at eighteen miles per hour, and it was able to reach higher speeds in short bursts. It may be that dolphins are faster over long periods and that sharks are faster for very short periods, a speed they use in attacking prey.
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|Title Annotation:||Science letters|
|Publication:||Highlights for Children|
|Date:||Jan 1, 1997|
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