sˈʌðɚn lˈɛpɚd fɹˈɑːɡz ɑːɹ bᵻlˈiːvd tə hɐvbɪn ˌɪntɹədˈuːst tə ðə pɹˈɑːdoʊ flˈʌd kəntɹˈoʊl bˈeɪsən vˈaɪəɹ ɐ ʃˈɪpmənt ʌv əkwˈæɾɪk fˈɔːnə tə ðə tʃˈiːnoʊ ɡˈʌn klˈʌb ɪn nˈaɪntiːnhˈʌndɹɪd twˈɛnti nˈaɪn ɔːɹ nˈaɪntiːnhˈʌndɹɪd θˈɜːɾi; ðeɪ ɑːɹ nˈaʊ kˈɑːmən ɪn ˈɛɹiəz ʌvðə bˈeɪsən ˌʌndɚɡˈoʊɪŋ ˌɜːbɐnᵻzˈeɪʃən.
Southern leopard frogs are believed to have been introduced to the Prado Flood Control Basin via a shipment of aquatic fauna to the Chino Gun Club in 1929 or 1930; they are now common in areas of the basin undergoing urbanization.