The ears of salamanders and caecilians are less highly developed than those of frogs as they do not normally communicate with each other through the medium of sound.
ðɪ ˈɪɹz ʌv sˈælɐmˌændɚz ænd kiːsˈɪliənz ɑːɹ lˈɛs hˈaɪli dɪvˈɛləpt ðɐn ðoʊz ʌv fɹˈɑːɡz æz ðeɪ duːnˌɑːt nˈoːɹməli kəmjˈuːnᵻkˌeɪt wɪð ˈiːtʃ ˈʌðɚ θɹuː ðə mˈiːdiəm ʌv sˈaʊnd.