male / female

Question
How can u tell if a ferret is a male or a female?

Answer
Look on the belly of the ferret, about halfway between the
tail and the bottom of the rib cage.  If you see what looks like an
"outie" belly button, it's a male -- and it's not a belly button.
Otherwise, look just in front of the anus for a second opening,
perhaps with a tiny flap of skin.  If you see that, it's a female.

To double-check, look at a once-used litter pan.  Ferrets usually
urinate and defecate in one "sitting," and because of the anatomy
described above, males leave puddles a few inches in front of their
piles, females right on top.