Thank you for your kind words, Krisztina, but I really just provided GB with information from some *excellent* sources like http://listserv.cuny.edu/archives/ferret-search.html http://fhl.sonic-weasel.org and http://www.afip.org/ferrets/index.html Here are some of the direct URLs which I sent privately geared to the specifics he mentioned so they weren't in the FML (and I also strongly, strongly, strongly recommend the past posts by Dr. Tom Willard whose doctorate is in veterinary nutrition and more of the writings of Dr, Bruce Williams at the afip URL above): http://fhl.sonic-weasel.org/browse.php?msg=YG2341 http://fhl.sonic-weasel.org/browse.php?msg=YG5327 http://fhl.sonic-weasel.org/browse.php?msg=SG259 http://fhl.sonic-weasel.org/browse.php?msg=YG6139 http://listserv.cuny.edu/Scripts/wa.exe?A2=ind0407&L=ferret-search&P=R6425 http://listserv.cuny.edu/Scripts/wa.exe?A2=ind0407&L=ferret-search&P=R10693 http://listserv.cuny.edu/Scripts/wa.exe?A2=ind0407&L=ferret-search&P=R11978 http://listserv.cuny.edu/Scripts/wa.exe?A2=ind0407&L=ferret-search&P=R13106 http://listserv.cuny.edu/Scripts/wa.exe?A2=ind0407&L=ferret-search&P=R13530 By the way, a selection of wonderful resources (but certainly not all wonderful resources) related to ferret health and their well-being can be found at http://www.ferretcongress.org >But I have noticed for 2-3 weeks, that he has became a very unfriendly >ferret with humans (he tries to send off our friends from our flat, if >they don't understand his attempt, he bites very hard.) but he likes us >as before. I don't understand his behavior. Could you help me why does >he do this? > >Does he try to protect us, Lui or his territory? That is possible but also possible is an adrenal growth. I advise reading about those so that you already have that information and sharing it with your vet. http://www.afip.org/ferrets/aae.html is helpful and the adrenal posts by Dr. Jerry Murray ( Use AFERRETVET in the from part of the search.) in the sonic-weasel address above are marvelous. Although I haven't mentioned it earlier in this post the following site is a treasure for adrenal growth information: http://www.miamiferret.org/fhc Rebecca, I think that it is marvelous that you know those researchers who have made such headway with paralysis! Ferrets don't often have spinal cord injuries; most of their hind leg problems are actually part of the way they respond to many severe illnesses, esp. Insulinoma, but now and then one does hear of ferrets who do have injured spinal cords. It will be wonderful if many species are helped by this work. I didn't even first hear of that from a science news source; it was just in a regular internet press source. I am SO enjoying the "What my ferret taught me" posts! They have such wisdom and smiles in them! [Posted in FML issue 4719]