By developing aversions to certain flavours appearances etc. Basically, the ones that keep eating that poisonous berry keep dieing, the ones that don’t like it live. So eventually the whole species doesn’t eat that berry.
Also, with many animals, we keep finding out they have more of a “culture” than we tend to think. So, learned behaviours that parents pass on to their offspring and that the same species didn’t do until some learned it and spread it.
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