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Replying to @sarahdoingthing
@sarahdoingthing The placental arms race seems to be extra-horrific in humans, dunno why.1 reply 0 retweets 1 like -
Replying to @sarahdoingthing
@sarahdoingthing I seem to remember reading something about them being extra bad in humans specifically but I may be misremembering.2 replies 0 retweets 0 likes -
Replying to @St_Rev
@St_Rev eh la wik says many primates do it, though primarily higher ones I guess http://en.wikipedia.org/wiki/Menstruation_(mammal) …
12:09 AM - 24 Jul 2014
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