Female mollies (Poecilia) show pre-existing biases for male "swords", sign that preference evolved prior to trait. http://beheco.oxfordjournals.org/content/early/2015/08/21/beheco.arv130.abstract?papetoc …
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Female mollies (Poecilia) show pre-existing biases for male "swords", sign that preference evolved prior to trait. http://beheco.oxfordjournals.org/content/early/2015/08/21/beheco.arv130.abstract?papetoc …