In anurans, males usually arrive at the breeding sites before females and the vocal chorus they produce may stimulate ovulation in females and the endocrine activity of males that are not yet reproductively active.
ɪn ˈænjʊɹɹənz, mˈeɪlz jˈuːʒuːəli ɚɹˈaɪv æt ðə bɹˈiːdɪŋ sˈaɪts bᵻfˌoːɹ fˈiːmeɪlz ænd ðə vˈoʊkəl kˈoːɹəs ðeɪ pɹədˈuːs mˈeɪ stˈɪmjʊlˌeɪt ˌɑːvjʊlˈeɪʃən ɪn fˈiːmeɪlz ænd ðɪ ˈɛndoʊkɹˌaɪn æktˈɪvᵻɾi ʌv mˈeɪlz ðæt ɑːɹ nˌɑːt jˈɛt ɹᵻpɹədˈʌktɪvli ˈæktɪv.