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![InterestingSTEM Avatar](https://lunarcrush.com/gi/w:24/cr:twitter::1659871093513920512.png) Interesting STEM [@InterestingSTEM](/creator/twitter/InterestingSTEM) on x 643.8K followers
Created: 2025-07-21 17:46:11 UTC

This brain test from Japan asks you to spot a butterfly, a duck, and a bat hidden in the picture.

Find X = old brain
Find X = normal brain
Find X = your brain is still young… which brain is yours?

![](https://pbs.twimg.com/media/GwZisT1X0AALFpD.jpg)

XXXXXX engagements

![Engagements Line Chart](https://lunarcrush.com/gi/w:600/p:tweet::1947352417496141936/c:line.svg)

**Related Topics**
[bat](/topic/bat)
[duck](/topic/duck)
[japan](/topic/japan)

[Post Link](https://x.com/InterestingSTEM/status/1947352417496141936)