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11 animals that have a sixth sense

By: Bryan Nelson on Sept. 22, 2010, 1:20 p.m.
Two dolphins swim through water

Photo: LaPrimaDonna/Flickr

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Dolphins and porpoises

These charismatic sea mammals have the incredible sixth sense of echolocation. Because sound travels better in water than in air, dolphins are able to create a three-dimensional visual representation of their surroundings based entirely on sound waves, much like a sonar device.

This is a necessary adaptation, especially for river dolphins, because vision is often extremely limited in murky water. Dolphins can navigate through a river of tangled branches with ease even if their eyes completely covered.