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Two animals are of the same species if their offspring is fertile. The dead animal is a result of cross-species mating. Probably its dad got lost, had too much berry, some of it a bit fermented, felt a bit horny and humped anything that barely resembled a bear, or beared a bearish resemble, or… Okay, enough with bad jokes. The point is, the dead animal was infertile, so there’s no loss to the nature by its killing.