bunnys somtimes bite and nip as well asnuge you with their head when they want to be groomed (petted) here issome good info from the website
http://www.muridae.com/rabbits/rabbittalk_hierarchy.html
Unlike most cats, but like dogs, domestic rabbits are very socialanimals. The domestic rabbit comes from Europe, where its wildrelatives typically live in colonies of up to several dozenindividuals. They share living space and food, warn each other aboutdanger, and establish a hierarchy in which each rabbit knows his or herplace. Unlike rabbits in the wild, rabbits who are neutered and livingin human homes don't necessarily form two separate hierarchies formales and females, and who is dominant may depend little upon theirsex. Somewhat like chickens, where the hierarchy is evidenced by whopecks who (the infamous pecking order), rabbits demonstrate dominanceby establishing who grooms who (the licking or grooming order). Don'tworry, though. You are permitted to groom with your hands rather thanyour tongue.
Although a royal (dominant) rabbit will sometimes groom one of his orher vassals, including licking you, it commonly goes only one way. Thetop rabbit in the group must be worshipped and obeyed by all, and maypresent him or herself for grooming to any other rabbit, who mustcomply. Although grooming does help keep those hard to reach placestidy, it's very much a social activity, and a critical one for mostrabbits' happiness. Who would guess that getting a little forehead rubnow and again could be the key to self-esteem, comfort and well-being?Oh...you might enjoy it too.
A rabbit will present itself for grooming by coming right up next toyou, maybe nudging you a bit with its nose or poking its nose underyour hand or foot, then lowering its chin and chest to the ground, andstretching its head forward while keeping its rear up a bit. While theears may get laid back a little, this is quite different from thesignal for fear (in which the head is never stretched forward) or anger(which is almost always indicated while standing).
This is not generally a request for grooming; most often it is morelike an order. Disobeying this order can lead to unhappiness, chewingon your clothing, or even an annoyed nip. Repeatedly ignoring arabbit's invitation for grooming will lead to insult and frustration,which can in turn result in having your rugs shredded, your baseboardsremoved, and your pillow peed upon. It's way easier to provide at leasta few strokes on the forehead upon request to support your rabbit'sself-esteem.
As mentioned, an invitation to groom is not just a polite request, andrefusing can have unpleasant consequences. Another way to get yourattention for grooming, popular if you are sitting in a chair at a deskconcentrating on work, for instance, is to "dig" on top of your foot byscratching hard. This makes for a real surprise if you don't know therabbit is down there and you aren't wearing shoes or socks. Aninvitation to groom is serious business.
Some very aggressive rabbits may use biting even more than grooming toestablish and demonstrate their dominance. A rabbit establishingdominance by biting typically won't just nip, as rabbits may do to getyour attention or even because they're excited, but instead may bitedown hard and even hold on tight. Obviously you will want to break therabbit of this habit, and quickly! The
bibliographyat the end of this guide includes some references for dealing withoverly aggressive bunnies.
Some lordly rabbits will lay across the necks of subordinate rabbits toconfirm their dominance. This may be why holding down a rabbit with afirm (but not too firm!) hand over the neck and shoulders will oftencause it to quiet if you need to settle it down for nail trimming orear inspections.
Some rabbits are less tied to the necessities of hierarchy, and mayequally come to you for grooming and lick you in turn. Other rabbitsmay not participate in establishing dominance with other rabbits,refusing to provide grooming but not demanding they be groomed. Everyrabbit is an individual with its own personality that you'll have tolearn for yourself. All rabbits like being groomed, though, unlessthey're scared, angry, or too insulted to have anything to do with you.
Some rabbits will lick objects around you, rather than your body or theclothes you're wearing. This is used to indicate that they like youvery much even though you're a subordinate. It will be performed veryclearly in your view and while watching you. They seem particularly tochoose objects that have your scent, such as places where you sit orclothing you're removed. I think it's fair to interpret this as givingyou the gift of being groomed, though indirectly.
You may wonder how you're going to get your rabbit to obey you inanything (e.g. going back into her or his cage) if you aren't the boss.The answer is that rabbits are perfectly capable of believing severalthings at once. As long as you demonstrate they're the big boss byobeying the licking order, you get to be the little boss and be obeyedin everything else. That should give you some idea of a rabbit'spriorities. A rabbit can be completely secure in its high status andstill obey your commands. It's great that human and rabbit prioritiesare completely different, so that all of us can get what we want andneed.