You'd be surprised how many parents prefer pets with short life spans. (petbusiness.com)
Moreover, compared with our knee, artificial products have a relatively short life span... Our knee, of course, is made up of living cells that are constantly renewed. (religion.blogs.cnn.com)
Other mammals need this nutrient for accelerated physical development (so they can walk / run a few hours after birth); however, they have a much shorter life span. (laurelofleaves.com)