Some horse barns put little fishes in the drinking water troughs. The fish eat the larvae. The horses ignore the fish.
They just started doing this in Florida to deal with dengue cases this year. Mosquito fish!
https://en.wikipedia.org/wiki/Mosquitofish
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They just started doing this in Florida to deal with dengue cases this year. Mosquito fish!
https://en.wikipedia.org/wiki/Mosquitofish