It's not exactly a 'behavior,' but I'll post it here anyway. My first and only couple - a baldy white guy and a chocolate-skinned redhead - give birth blonds one after another. Maybe the white guy used to be blond before he went bald. Maybe my blondie children will lose all their hair once they reach 20. I'm not actually complaining, in real life I'm quite partial to bald guys. I worry, because one of the blondies is female. XD