If only it were that simple. Some animals, and especially plants and fungi survive through mere persistence and hard-hardheadedness even when they have no heads. There are lobster and sea urchins that from our human standpoint, do not seem to age at all. There are colonies of aspen trees and subterranean mushrooms that are just cloning and rebudding themselves into eternity and it will take the super-novaing sun swallowing up the Earth to stop them. Then there is Man. So clever he may yet escape his native sun's extinction and colonize planets far away, and survive as long as this or whatever other universe's there are do, but who can say if he won't kill his own kind off himself first. Avians are just a bird-brained coward by comparison to any of these, but they are pretty!