The reproductive system has evolved for internal fertilization, with a copulatory organ present in most species.
ðə ɹᵻpɹədˈʌktɪv sˈɪstəm hɐz ɪvˈɑːlvd fɔːɹ ɪntˈɜːnəl fˌɜːɾɪlᵻzˈeɪʃən, wɪð ɐ kˈɑːpjʊlətˌoːɹi ˈɔːɹɡən pɹˈɛzənt ɪn mˈoʊst spˈiːsiːz.