Advice needed one of my lion head Rabbits has just died?

im sorry to hear about your loss. i have heard from a vet, as weird as this may sound...rabbits aren't supposed to eat carrots...mad i know as that's what the are ociated with all the time...anyway this could or couldn't be it...you could have an autopsy done on your bunny (i know it isn't a nice thought) it may have had an underlying health problem that hadn't been found. all i can suggest is to keep a close eye on your remaining rabbit. also to answer other part of your question. rabbits can be rather territorial and yes your rabbit may have been ok with the other but that was because it had been brought up with her. if you bring in another rabbit it will have another scent and they may fight. but if you do decide to get another one then maybe get them used to each other slowly by having them seperate and maybe swapping some hay from each cage to the other so they can get used to the scent and then move onto puttin them in a room together supervised to see how they are with each other. it may take time so you have to be patient but make sure that if you get a male that he is neutured or you will have more babie then you have had hot dinners =D