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The original was posted on /r/todayilearned by /u/Head-Medicine-5634 on 2025-04-20 17:50:41+00:00.

Original Title: TIL that the Large Blue Butterfly (Maculinea arion) is carnivorous in its caterpillar stage, feeding on the red ant (Myrmica sabuleti) larvae by mimicking the sound and scent of their queen ant to infiltrate their colonies. 40 years ago it became extinct in Britain but was reintroduced from Europe.