not sure why, but i guess they are made to make babies, then die. and they get eaten a lot of the time by the females. it could be like salmon, after mating they die. there are lots of animals like this.
i know. my girfriend is studying forensic anthropology and asked me the other night why my a. avic was acting like he's had a stroke. i told her it's 'old age' but could not tell her why this happends biologicaly.
first, there is the molt thing - they just cannot pull out their sexual organs.
second, they have to take up a wandering life after they mature, to get to the static females. there is just no time for finding food while you are up and about to mate with as many females as possible. many males die from starvation or being eaten.
so, what would be the point of a longer life once they have fulfilled their role in procreation (from a biological point of view)?