They are brother and sister. I havent caught who is not covering yet. I will have to pay attention next time. Thats pretty intresting about the rank. Thanks.CyberPet said:Is it the only cat in the household? Usually the cat with the highest rank dont cover its poop, so if it's alone it migth feel it dont need to cover it. My female cat dont cover hers, while the male does, which implies that she might be ranked higher than him (they are litter mates).