Lifespan increases with gestation period, and also with body mass, so that elephants live longer than mice, have a longer period of gestation, and are heavier.
lˈaɪfspæn ˈɪŋkɹiːsᵻz wɪð dʒɛstˈeɪʃən pˈiəɹɪəd, ænd ˈɔːlsoʊ wɪð bˈɑːdi mˈæs, sˌoʊ ðæt ˈɛlɪfənts lˈaɪv lˈɔŋɡɚ ðɐn mˈaɪs, hæv ɐ lˈɔŋɡɚ pˈiəɹɪəd ʌv dʒɛstˈeɪʃən, ænd ɑːɹ hˈɛviɚ.