Lemmings

"We must consider suicide as an exclusively human behavior, since man, unlike other animals, can cease to exist at will following a premeditated act. In order to be able to speak of animal suicide, there must be an awareness of the irreversibility of the act and of the death that will follow. Except for the human being we cannot affirm that in the animal world there is this certainty about the finitude of its existence. The animal does not recognize itself as mortal, and does not know that it is going to die, therefore He cannot think about his death, nor wish it, nor plan it, nor finally carry it to completion. "

Ginés Jesús Llorca Díez