Ok, maybe you haven't ever even given it a second thought...maybe you figured it was all just in the X and Ys of life. But, it is pretty interesting if you listen to this animal fact as to just what does determine the sex of the hatchlings.
Leatherback Turtle Eggs Girls or Boys Animal Fact
Watch on youtube.com
Oh now don't tell me you didn't just learn something from an old lady with a head full of stuffing. Puppets...they aren't as silly as you thought, eh?