A study out in today’s Science Magazine by Takashi Nagata, Mitsumasa Koyanagi, Hisao Tsukamoto, Shinjiro Saeki, Kunio Isono, Yoshinori Shichida, Fumio Tokunaga, Michiyo Kinoshita, Kentaro Arikawa and Akihisa Terakita proposes that jumping spiders at least, use image defocusing to provide depth perception. Jumping spiders (Salticidae) are the largest family of spiders and have perhaps the best visual acuity of the invertebrates.
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