I came to see that man finds meaning in his existence only through the active demonstration of his human self, a cosmos comprising the entire constellation of life's factors: culture, civilization, tradition, history, ideals, facts, physical conditions, one's mental state, the ecology, and so on.
Animals are not supposed to have the power to reason and therefore don't care whether there is life after death. But imagine animals trying to cheer themselves up in the same way that our own ancestors did when faced with death, by believing that there is life after death. How would they resolve the problem that in the afterlife they might once more be eaten by man?