We bought two bunnies a few weeks ago, one a week later than the other. Both believed to be females. They really liked each other, always laying their head under one another and grooming each other, always together. Today, the younger bunny wouldn't really come out the cage, but my older bunny seemed to be normal. Later on I checked on them, they're hopping around dodging each other and chasing each other, some fur was loose and my older one seems to have blood on him. They are currently seperated right now, is this normal? Do bunnies break out into fights? Or should I permanently keep them seperated? Thanks