Something very weird goes on in mating assemblies of the White-barred Acraea butterfly - males and females swap roles. Why? And what can it tell us about a secret natural force shaping whole populations of insects?

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Music

Opening & Closing Themes: Running Waters and Acoustic Meditation by Audionautix (Jason Shaw), from audionautix.com. CC BY 3.0.

Modified versions of: Headway, modum and periculum by Kai Engel, CC BY 4.0