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I think we should get away from the idea that "nature" is "giving" anything to these animals.
"Nature" is not a conscious being. We need to recognize that evolution is not a cohesive process; indeed, species intertwine in one moment and don't the next. It's constantly changing.
The point is that the fruit did not evolve to get the animal high; and the animal did not evolve to get high by that fruit. It just so happened that the fruit evolved in one way -- to produce some chemicals -- and some animal crossed paths with it. The animal, feeling the chemical effects of the fruit (not necessarily via ingestion...smell is a chemical process, too), obviously enjoyed it and thus promoted the fruit's biological spread in some way.
Nature didn't give the animal a way to get high, the animal found a way to get high.
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