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Maybe they keep bats too busy to eat a more nutritious prey animal, and keep the population from expanding though malnourishment? Similar to the diet of a panda bear, though they unfortunately have no higher-caloric alternative.



I think mammals are smart enough to eat the food with the most nutritions per effort.


Pandas and Koalas have extremely poor diets in terms of nutrition. It's likely there are other examples as well.


Looks like evolutionary dead end.




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