NOT A GOOD IDEA to keep them a few facts about them are
1. they do bite and when they do they bite to the bone and then lock there jaws
2. they smell REALLY REALLY BAD
3. if one got out say good by to your chooks
4. they are not good with other animals or kids
5. they are killers and have been known to kill a cat
but if you can get the bedding and put it down or around rats they should run away
utter tosh ( 1 ) If ferrets bite it is because they have not been handled enough by the owner
( 2 ) They only stink if they are not cleaned out ever day.
( 3 ) Your right they will kill your chucks but a sensible approach will resolve this ( Don't let the ferret live by the chucks)
( 4 ) They are excellent with other animals and especially kids.
( 5 ) I have never heard of a ferret killing a cat the other way round probably but as long as I have had them in the past i have never heard this.
( 6 ) Rabbits and Guinea pigs can bite too if not handled
As a county sport enthusiast I have seen ferrets work with dog's I.E Terriers for ratting and rabbiting. Working very very well with bird's of prey again for rabbits.
If they are handled lot's and are cleaned out every day they make wonderful workers or wonderful pet's.