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what a species is, why it is so difficult to define, and how we should best determine the boundaries between species. This is the basic general definition: A species is often defined as the largest group of organisms in which any two individuals of the appropriate sexes or mating types can produce fertile offspring

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  • $\begingroup$ While your question does not sound like a duplicate of the post How could humans have interbred with Neanderthals if we're a different species?, the answers there will definitely answer it. Therefore, I voted to close as duplicate of How could humans have interbred with Neanderthals if we're a different species?. $\endgroup$ – Remi.b Jul 23 '19 at 19:42

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