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We do what?
Ohh, I actually knew about this already... because it's not worms but fly larvae. They drop sterilized male larvae to "mate" with females and thus produce no offspring. Only for one specific type of fly though. The video has much more details but that's the gist of it.
This is one of the craziest things I’ve ever learned.
Great video! I had no idea this even was a thing, thanks!