Jumping spider uses fuzzy eyesight to judge distance

(PhysOrg.com) -- One of the ways in which humans determine distance is by estimating the sharpness of an image—closer objects produce a sharp image, while those further away are out of focus. For us, this is a minor additional method of judging distance, but now scientists in Japan have for the first time found an animal that appears to use this method as its primary means of depth perception.

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