Why the predators are called as prudent.

Predators are called prudent because they eat the prey population in a manner that the prey population continues to survive and is not overexploited.It is necessary for the survival of predator population because in absence of preys they will also get extinct sooner or later. It has been observed that predators prudently eat those preys which have a high probability of dying from other causes like illness. But, some scientists suggest that prudency of predators is just because the prey have adapted so well to escape that only lesser fit individuals are eaten.