During the Triassic Period (252 to 201 million years ago), the reptiles continued to out-compete the amphibians, leading to a reduction in both the amphibians' size and their importance in the biosphere.
dˈʊɹɹɪŋ ðə tɹaɪˈæsɪk pˈiəɹɪəd tˈuːhˈʌndɹɪd fˈɪfti tˈuː tə tˈuːhˈʌndɹɪd wˈʌn mˈɪliən jˈɪɹz ɐɡˈoʊ, ðə ɹˈɛptaɪlz kəntˈɪnjuːd tʊ ˈaʊtkəmpˈiːt ðɪ æmfˈɪbiənz, lˈiːdɪŋ tʊ ɐ ɹᵻdˈʌkʃən ɪn bˈoʊθ ðɪ æmfˈɪbiənz sˈaɪz ænd ðɛɹ ɪmpˈoːɹtəns ɪnðə bˌaɪoʊsfˈɪɹ.