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Tuesday 30th August 2016
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Why is a shark's tail vertical, but a dolphon horizontal?


dolphins.jpgA shark's tale is vertical in the water, but a dolphin is horizontal. Which is the faster swimmer because of this?
Russell, Shepherd's Bush


** Definitive **
Name: Simon, Hampstead
Qualification: Studied physiology
Answer: It's to do with breathing. Dolphins need to breach the water to breath air so the upwards tail motion is important to help them breath. A shark or fish swim horizontally, which helps them breath through their gills. My gut feeling on who would win over a race is that a dolphin would have the better start, but the shark would build up a head of steam and eventually win.

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