does anyone know about bunnys

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i have 2 baby bunny's and they are wild there mother bunny got ate by a dog so i have been taking care of them. what i was wanting to know is i got them in a cage.and they go around and around and jump real high and try to act the other bunny is in the cage. my b/f said they are trying to get out but fighting i don't understand that. they bother or sister i real don't know what they are yet. but i am afraid they are going to get hurt. i pick one of the bunny up and he got a big places on him do you got any ideals. please let me know thanks i am worried about the bunnys