X-Post referenced from /r/technology by /u/marinaraleader  
[Scientists gave praying mantises tiny 3D glasses to prove they have tiny-3D vision](https://www.reddit.com/r/technology/comments/401ebn/scientists_gave_praying_mantises_tiny_3d_glasses/)
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The ability to perceive depth using binocular vision.

What does the article mean by "3d vision"?

Scientists gave praying mantises tiny 3D glasses (xpost from /r/technology)