Hippos play "possum" The first time I saw Dorey do that scared the living daylights out of me. Was laying on her side like she died. I had almost fished her out to toss her. It is funny how many fish play possum. I have been at the LFS when they had a large shipment and are dripping the fish. I look in the containers and half the fish look dead..laying on their sides, while the others are swimming around all happy! However you look closer and they are breathing and when they get into the tank they start swimming around like nothing happened. I was there one day when a customer grabbed a net and went to remove a fish...he thought it died. It was a wrasse that sleeps on the sand on its side and luckily the workers caught him and stopped him!