Therearemorethan8.7millionspeciesfoundonourplanetandeachspecieshasitsownlifespani.e.theaveragedurationforwhichaparticularspecieslives.Thislifespandiffersforeachspecies.Animalslivingundernaturalconditionsrarelyapproachtheirmaximumpossibleagebecauseofveryhighdeathratesduetoinfantmortality,diseases,predators,badweather,habitatdestruction,or