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Doesn't nature usually try to avoid that?
Inbreeding is a lot more common in other species, humans are the most closely related species on the planet we are VERY suseptible to incest and population collapse. If you look at species around you, like crows or ravens, you'll find out they're not just one kind, but multiple unique populations all around your area.
Apart from tigers and a few others which went through even worse bottlenecks
Pretty sure it's why animals fight when mating. If you're not strong enough to keep your dick in and fight at the same time you don't get to mate.
Gettin' a little rapey there, animal kingdom.
Dick bones don't exist for funsies!
Not to mention contra-spiral cloacas.
Ducks have entered the chat
Oh... it's not even a little. Its pretty bad. Just don't find out about penguins.
we had chickens when i was growing up, and yeah i was traumatized. chickens are HORRIBLE with this and it's brutal.