When the mother hears chirping sounds, she removes the nest covering, sometimes breaking the eggs if the hatchlings have not already done so with their specially provided shell - breaking tooth.
Sewaktu ibu buaya mendengar bunyi ciapan, ia menyingkirkan penutup sarang, adakalanya memecahkan telurnya jika si anak belum melakukannya dengan gigi khusus pemecah - cangkangnya sendiri.