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Tarantulas' lateral eyes calculate distance


Still Waters

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A necessary part of any animal's sense of direction is a positioning system, allowing it to have an idea of the relation between where it is and where it wants to go; this is known as odometry. A new study shows that tarantulas use their posterior lateral eyes and anterior lateral eyes (they have a total of four pairs of eyes) to establish the distance they have traveled.

L. tarantula uses path integration to return to its burrow. With this mechanism, it does not follow the same path back to its burrow; instead, it moves as though it had followed the sides of a right-angle triangle, returning along the hypotenuse.

https://www.sciencedaily.com/releases/2017/04/170420093729.htm

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