as i see it any ferret that nips isnt or hasnt been handled ither correctly or enough times thats my personal view on the matter coz i have never had this problem with my own litters but i have from other ferrets i have bought fine when you get them take them home then next day they wana nip! now maybe this is just over food coz there used to compertition, but am not sure still one of them make ya own mind up!