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The original was posted on /r/biology by /u/Middle-Power3607 on 2025-10-02 15:36:13+00:00.

Basically, this is a 2 part: in humans, different people are attracted to different things: different shapes, sizes, races, hair color, etc. but with animals, it seems like a “one size fits all”: the members of a species that develop the most significant of a feature: biggest antlers, brightest display of feathers, fanciest mating dance, etc… almost always get the mates. Second, different species can interbreed- horses and donkeys, coyotes and dogs/wolves, bar headed and Canada geese, etc. what leads these animals to seek out a member of a different species as a mate? Could there be other examples, where 2 species choose to mate but DONT produce offspring? Even entirely unrelated species?