<table><tr><th>From:</th><th>Robert Trivers</th></tr><tr><td>Sent:</td><td>Saturday, February 11, 2017 2:46 PM</td></tr><tr><td>To:</td><td>Jeffrey Epstein</td></tr><tr><td>Subject:</td><td>transsexuality in rodents</td></tr></table>

Jeffrey

just =ealized that transsexuality—not transvestism—is common in =ome mammals

in rodents such as lemmings, X'? male= develop as full females, only problem is that mating with full males (XY).= 1/4 of their progeny are `Of—lacking an X entirely they die early =n uterine life

but because they are lost so quick=y the mother can easily replace them with very young embryos which quickly=causes X* to 'drive'—that is, replicate faster than X, hen=e you end up with males (XY), classical females (XX) and then transsexuals=(XsY)

i have known about this for years (Burt and=Trivers 2006) and more bizarre cases still— XY*, much harder to se= how they thrive

so this is a deeper slant to tra=ssexuality—God knows without any human psycho-sexual content but g=atifying for me— a larger canvas on which to paint the full argumen=, when i am ready to paint

all best

bob