The eggs are surrounded by amniotic membranes which prevents them from drying out and are laid on land, or develop internally in some species.
ðɪ ˈɛɡz ɑːɹ sɚɹˈaʊndᵻd baɪ ˌæmnɪˈɑːɾɪk mˈɛmbɹeɪnz wˌɪtʃ pɹɪvˈɛnts ðˌɛm fɹʌm dɹˈaɪɪŋ ˈaʊt ænd ɑːɹ lˈeɪd ˌɔn lˈænd, ɔːɹ dɪvˈɛləp ɪntˈɜːnəli ɪn sˌʌm spˈiːsiːz.