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* If your unneutered female rabbit begins pulling out the fur on her stomach, and gets antsy when you try to pick her up, she is either pregnant, or having what is called a "false pregnancy," which is similar to little girls playing "mommy" at home. Don't discourage this, pick her up or force her out of her cage, at the price of her distrust of you. She will eventually stop this behavior, but may start again at any given time. The best solution is to have her spayed.
* If one rabbit appears to be mating with another's head, this is a territorial display, and could lead to a fight. Both male and female rabbits exhibit this behavior.