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Anonymous
>>1056108 IIRC in bio, I was taught that eggs had some kind of sperm recognizer protein complex or some shit. In any case, if the sperm wasn't from the same (or similar) species, the sperm wouldn't even be allowed to get in and fertilize the egg. It's one of the methods to prevent random species fertilizing each other and making shit offspring that die. Other times, chromosomes won't match up, so you'll get an egg with Super Down's, so to speak, and it'll abort itself. Still other times, the dick won't fit in the vagina so to speak (like a horsecock into a mouse). And if it somehow works out, like a horse with a donkey, what you end up getting is something like a mule, which has inert balls.
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