ðə ɹˈiːzənz fɔːɹ ðiːz lˈɑːɹdʒ dˈɪfɹənsᵻz hæv ˌɛvəlˈuːʃənˌɛɹi ænd fˈɪtnəs bˈækɡɹaʊndz, wɪð ɹᵻɡˈɑːɹdz tə mˈeɪɾɪŋ, æz wˈɛl æz fˈiːmeɪl kˌænɪbələzˈeɪʃən ˌɔn mˈeɪlz ˈæftɚ kˌɑːpjʊlˈeɪʃən.
The reasons for these large differences have evolutionary and fitness backgrounds, with regards to mating, as well as female cannibalisation on males after copulation.