I copied this from http://www.ferretcentral.org/faq/, I hope this helps. http://www.ferretcentral.org/faq/part3.html#trembling "My ferret trembles a lot. Is that normal? Generally, yes. Ferrets normally tremble for two reasons. First, they often shiver right after waking up, in order to raise their body temperatures. Second, they shake or quiver when excited or frightened. For a young kit, this could well be all the time, since everything is new and interesting. For older ferrets, a bath or even a good scolding could prompt trembling. If your ferret's trembling persists with no apparent cause, first make sure there's no cold draft around. (Ferrets can live fine outdoors, with blankets and shade, but indoor lighting can cause their winter coats not to come in until long after it's gotten cold enough outside to need one.) If that's not the problem, check with a vet." Kris http://groups.yahoo.com/group/CarpetSharksInk/ [Posted in FML issue 3981]