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Nipping and biting
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The most obvious sign of aggression, nipping and biting, come in various degrees of severity. Rabbits feeling threatened or annoyed may nip another rabbit or a hand. This is just a warning to "back off." If the rabbit is feeling cornered or territorial, the nip may escalate into a full-on bite that draws blood.
Lunging
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Another obvious sign of aggression is when the rabbit lunges at some offending object. When a rabbit lunges, it's saying that it wants to be left alone. Continuing to interfere with it might result in a nip.
Stance and Tail
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Rabbit tails are usually held tightly against their bodies. A tail held stiffly up and away from the body indicates the rabbit is tense about something. It is usually accompanied by a rigid body stance with front legs held apart instead of close together. This body language indicates the rabbit is preparing for a lunge.
Charging
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Taking lunging a step further, some rabbits may run at another rabbit, a person's feet, or at a hand reaching into its cage. Rabbits typically engage in this behavior if they feel their territory or "personal space" is being threatened.
Ears
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A rabbit's ears are the most expressive part of its body, and they offer many clues about the animal's mood. When a rabbit is happy and relaxed, it usually holds its ears up and pointed forwards. As the rabbit becomes increasingly annoyed, it will rotate its ears sideways, then backwards. A sure sign of a troubled rabbit is one with its ears pointed backwards and held flat against the body.
Growls and Thumping
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Rabbits are not very vocal creatures, but angry rabbits will make noises that sound like short growls or grunts. Rabbits also thump their hind legs as a means of warning those around them of potential danger. However, thumping can also be a sign that the rabbit is annoyed and ready to jump at something.
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