this post was submitted on 19 May 2026
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Spiciness is a defense mechanism, but not against humans or other animals.
Spiciness doesn't protect a plant against mammals -- many mammals actually enjoy it, and humans aren't the only ones who actually prefer spicier peppers. Birds can't even taste it at all. And it does nothing to prevent insects.
What it actually does prevent is fungal infections. Spicier peppers are less susceptible to fungus problems. And this is backed up by observations in the wild: wild peppers from wetter, more humid regions tend to be spicier, while wild peppers from dry regions tend to be less spicy.
You can use this in real life in your bird feeder by spraying something spicy on the bird seeds. After a couple of tries the squirrels will avoid the feeder.