sex differences result from more than hormones (on the importance of direct genetic effects) http://www.nature.com/nature/journal/v550/n7674_supp/full/550S6a.html?foxtrotcallback=true …pic.twitter.com/6TcFbYtykw
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It’s my understanding that, unlike some songbirds, zebra finches are so dimorphic even testosterone injections don’t enable female singing.