Lions and leopards - and hyaenas (and certain other smaller predators) will not only eat other animals that are already dead but will also 'steal' dead prey animals from other predators.

The only large predator in Africa which will only eat prey that it has killed itself is the cheetah.

Lions, leopards, wild dogs and hyaenas, for example, are all opportunistic - they will steal the (dead) prey form each other if possible, remembering that all predators have to conserve their energy and, as such, if they can steal prey from a 'weaker' competitor, that will save energy for them.

This is just one of the reasons that Cheetahs are endangered - they are, in comparison to all of the other large predators in Africa, 'the weakest link' and, as a result, they often have their kills 'stolen' from them by stronger predators.

As a general rule predators do not eat the meat of other (dead) predators (as opposed to prey species) - but they have often been recorded as doing so in certain circumstances... I could give many examples of this but it would be far more informative, for anyone who is interested in this subject, to research it for themselves.