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No, actually, this is something we are still trying to breed out of them. People have it in their heads that the domestic rabbit's wild ancestor, the European wild rabbit, is by nature social. While it is true that they are often found living in groups, there is some evidence that they are forced into it by environmental factors rather than doing it by choice. Rabbits can be astonishingly brutal to each other, when they can't have their own space.
Rabbits do a lot of communication through body language. A rabbit that is being territorial will stand rigid, body tensed, on its feet (not hunkered down) with its head up and ears back. High is dominant, low is submissive. They usually just slap with their front feet, launching such an all-out attack is rather unusual. I agree that pregnancy and kit raising can push an otherwise reasonable rabbit "over the edge," but this is going to be tough for you to deal with. That's a big rabbit to get roughed up by! (My vicious rabbit scar is on my wrist, and was done by a 2 lb. ND buck!) Good luck!