The very notion of protecting "endangered" species goes against nature. If they can not adapt and evolve to the world they live in then they no longer are fit for survival. Look at Pandas, they absolutely refuse to -blam!- and repopulate. Why should we bother trying to help a species that doesn't care about themselves?
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If they became endangered on their own then I don't care. If it's because of humans, then tell those humans to leave the species alone.... it doesn't even matter they will do w/e they want anyway.