But it wasn't milk it was egg nog.
[what exactly is nog and what kind of animal produces it?] I did some research....
Did you know that 'egg nog' is called 'lait de poule' in French?
And did you know that if you translated that back the other way 'lait de poule' would be 'milk of the hen' or 'hen's milk'.
My conclusion is that one must milk a hen to get nog. Can you imagine how small teats are on a hen?!
I bet you Bill Nye the Science Guy didn't know that.