Well it depends, you can feed them biscuits and/or meat. They love tucking into a rabbit every now and then but feeding them meat all the time makes them smell alot worse.
Nice ferrets btw, they're loving the milk!! Havent tried goats milk before.
I find biscs make them drink a heck of alot, and their faeces smell less when fed a meat diet.
Yeh defo bics in the summer, but when they are working its rabbit all the way!