African Wild Animals

In nature, this is the usual fate of animals such as zebras, giraffes, antelopes and deer to end their days to be killed and eaten by lions, etc.?

In fact 100%. Some are hunted and eaten by other scavangers after death from other causes.

All grazing animals are prey African roughly with the exception of elephants / Cape Buffalo and Hippo water. The other animals are predators / scavengers in the chain of life. It is extremely difficult to kill the three above-named animals because they have good systems of defense, attack in groups and defend their members, especially younger oldest /, as a group.