Which animal has the strongest tail?

There are 2 animals that have the strongest tail. The first one is the Thresher Shark. The Thresher Shark not only kills its prey by biting it, but also wacks its prey with its tail so hard that it loses its skin, which is a method called skinning.The Thresher Sharks tail is longer than the rest of its body.The second one is the Bob Cat. The Bob Cat uses its tail as a weapon used to wack the eyes to make the eyes closed and annoyingly painful, so that the opponent (not prey, because the tail is a defence weapon) cant know what the Bob Cat is going to do. If your talking about all time, then the T-Rex might have had the strongest tail ever.