Sometimes ferrets associate certain actions with nipping, pay attention to what your doing and change your actions. Also something in hand lotions may cause them to bite.
There is a product that called "bitter apple" spray which is a taste deterrent that can be used if necessary.
Why do ferrets bite?
Ferrets must be handled frequently and socialized properly from day one, just like any other pet. You handled them and train a ferret properly, it will not bite. Ferrets that have not been raised properly and/or abused, will bite and are known as a "fear biter". They bite for protection and out of fear.
Ferrets bite. Yes, ferrets do bite, but it isn't to be mean. They are less prone to biting children than are dogs and cats. You will simply need to teach your ferret that biting is not an acceptable behavior. Ferrets that have been handled when they are young are usually docile and gentle when handled. They rarely bite.
Baby ferrets, in particular, are quite nippy and squirmy during play and don't know their own jaw strength. This is perfectly normal with young ferrets--just as it is with puppies and kittens. Ferrets must be taught to be gentle beginning from the very first day.
Occasionally you will come across a ferret that is a severe biter. These ferrets are different from nippers in that the ferret might latch on to protect itself and often draws blood. Severe biters were not properly cared for from their previous home. The number one reason a ferret bites is their lack of trust or did not receive human contact early in life. A ferret that's not handled is going to be nervous. Biting is defensive.
Depending on your Ferret: how tame they are, what actions you are doing to it, and so on. Most Ferrets never truly bite (draw blood) most often it is a nip, almost to test the consistency or flavor of an object. When they do bite it is very painful, the main teeth (incisors) can go right through finger or thumb flesh in a heartbeat BUT this usually is due to mishandling: the Ferret is starving (and uses the bite to get your attention) is receiving pain or is terrified of something. If you get a well bred Ferret and treat it well don't expect a lot of bites.
Ferrets as baby kits will nip and bite when playing, it is important to handle them frequently and properly train them to ensure socialization. Older ferrets that have not been properly socialized or abused may be "fear biters', but with patience and time can be trained not to bite.
Ferret bites can hurt, especially when they are kits (baby ferret) or a fear biter (abused ferret). They have sharp teeth, and a very strong bite.
It is important to socialize your ferret from the start, that means to spend as much time when you ferret is young. Otherwise if it's not used to being around humans or is forced to spend a lot of time in the cage, he will become aggressive and will be a "fear Biter". Any animal will bite as a defense to protect themselves.
Baby ferrets normal behavoir for playing is biting. They play bite quite hard with other ferrets, which does not hurt each other because they have tough skin.
Advice from other contributors:
It's very hard to say without more information (gender, age, does it bite everyone or specific people, how bad is the bite etc) but the most common reasons are:
The bite force of the ferret is about the same as a large dog's bite. They have powerful jaws and very sharp teeth.
It depends on how hard the ferret bites which depends on why the ferret has bitten you. If the ferret is scared or you are hurting it, it will bite to defend itself. This bite could be serious and painful. If the ferret is playing (ferrets play rough) will sometimes give you a small bite which isn't very painful. Ferrets can be trained to not bite or nip during play by scuffing them when they bite as this tells them you didn't like the behaviour. You can also get spray to put on your hands which will teach the ferret that your skin tastes bad and so will discourage biting
he feels threned or indangered
It is doubtful they could bite your finger off but they can certainly give a nasty bite A ferret would not be able to bite a humans finger off, but they would be able to bite through your finger. They have very sharp teeth and a powerful jaw that can exert a great deal of pressure.
It depends on the individual ferret. A working ferret or a ferret that hasn't had much contact with humans or hasn't been handled much will probably bite, but one that is used to human contact will not. All ferrets bite gently during play (not enough to hurt), but this is simply a part of ferret behaviour - ferrets have tough skin and bite each other while playing, so they need to learn that humans are more delicate and mustn't be bitten hard. If your ferret does bite hard, grab him by the scruff, blow in his face and say "NO!" in a loud, stern voice - they soon learn. If he bites hard during play, grab him by the scruff, put him back into his cage and ignore him for a while.
A young ferret needs to be properly socialized and requires quite a bit of human interaction and playtime. Baby ferrets play together by biting each other. Is your ferret wanting more attention or just wanting to play with you. You teach a young ferret not to bite by scruffing, which is the way the mother ferret scolds her babies. When your ferret nips or bites, scruff him/her (gently grab the skin on the back of the neck with your thumb and forefinger (or index finger) and lift up a little and your ferret should relax, while saving "No" in an authorative voice. Never hit or flick your ferrets nose, as they don't understand that action.
A female ferret may or may not bite when they are pregnant, it depends on the individual as they each have there own personality
A skin infection and/or boredom.
giant pandas have them to bite bamboo
yes
All rabbits bite. It is their only self-defense.
To keep your blind and deaf ferret from biting, approach him slowly as not to startle him (if that's what making him bite) . He has a keen sense of smell, let him smell as you slowly approach him. An alternative would be to use a product called "bitter apple"