There are six or seven unrelated mammals that evolved to depend on eating termites, including a marsupial, a monotreme, and a wolf. "Don't put all your eggs in one basket" is good advice, but nature will persistently try every bad strategy until it works out. Nature is a terrible role model.
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In natural selection, mutations which limit capabilities tend to make that branch go extinct.
https://en.wikipedia.org/wiki/Myrmecophagy
There are six or seven unrelated mammals that evolved to depend on eating termites, including a marsupial, a monotreme, and a wolf. "Don't put all your eggs in one basket" is good advice, but nature will persistently try every bad strategy until it works out. Nature is a terrible role model.