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Darwin’s finches, which are a classic example of evolution, are dying off due to an infectious parasite that damages their beaks. The damage causes their mating calls to have an unpleasant tune, hindering their ability to reproduce. – WTF Fun Facts

Source: https://www.theguardian.com/environment/2019/jun/12/darwins-finches-sing-out-of-tune-mating-call-parasites-deform-beaks