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The original was posted on /r/todayilearned by /u/original12345678910 on 2025-06-16 08:29:42+00:00.

Original Title: TIL that ants can recognize themselves in a mirror. In an experiment, blue dots were marked on ants’ heads. When presented with a mirror, 23/24 tried removing the dot. Without the mirror, none tried to remove the dot, and nor did a control marked in a non-contrasting colour.