The first question would be, why do you want to provide darkness for your ferrets and when providing this darkness why do you then wish to watch them? I would assume that the darkness is to get your ferrets back in to a more naturale way of life so what I would do is to put the cage into say a bedroom where they can get a period of darkness anything from 12 hours in summer to 18 hours in winter. Apart from the above you could provide your ferret with a large parrot nest box fitted on to the side of there cage, this would allow your somewhere to get out of the light. Tony Please contact me I can be of any help, I am not a vet and in the past 30+ years none of my animals have visited my vet for anything other than routine check up. http://groups.yahoo.com/group/intact-ferrets/ Come see my ferrets http://www.geocities.com/houseferrets13uk/Tonys_Pets.html Some of our fund-raising events http://www.geocities.com/houseferrets13uk/Show.html http://www.headway.org.uk/ The brain Injury association [Posted in FML issue 5173]