Someone asked how you would be able to tell the difference.
I answered with "Sexual dimorphism"
I didn't even realize I had that phrase roaming around in my brain... The other gals looked at me and were like "Wow! Where'd that come from?" I guess I did retain a bit of my Zoology major knowledge.
So, for lucky13charm, kalfoley, Non-LJ J and anyone else who is curious, here is the wiki on sexual dimorphism: http://en.wikipedia.org/wiki/Sexual_dimorphism