I saw recently on Reddit, that this is because "we have the most aggressively parasitic young (fetus) of any species."
FWIW.
ETA: What about chickens? Not so much blood, but when they ovulate, boy, do they OVULATE!
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Shut up and hug. MoreThanPretty, Nov 5, 2008.
Just because I'm nominally polite, does not make me a pussy. Sundae Girl.
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