Just recently I've realized something, that I don't know if anyone else realized, but they probably have.
The Basilisk Harry killed in CoS...y'know, Riddle's Basilisk? I'm pretty sure it was a female.
From reading Fantastic Beasts and Where to Find Them for the sixtieth time, that little bit of information clinked into my mind, and I don't remember it ever being mentioned that Harry's green-skinned 'friend' had a scarlet plume on top of its head. The males have a scarlet plume, the book said, and females don't. So, this leads to my conclusion, that the Basilisk was female.
I guess that's all I have to say.