Our neighbor has recently gotten a new cat - it's still quite young. It's recently been going into our garden and sitting in the rabbit run and actively staring at them. At the moment at least, our rabbits don't seem at all concerned about the cat even when it's less than a foot away from them. This may be because they're both bigger than the cat or they're just extremely lazy.
Should I be worried about this behavior? Should anything be done about this or is it considered normal social interaction?