Nile crocodile eggs hatch naturally in French zoo due to heatwaves

France's heatwaves have produced an unusual outcome at a wildlife park, where 10 Nile crocodiles hatched without human assistance for the first time, the director of the reserve said on Wednesday. While Nile crocodile eggs naturally incubate in underground nests in the wild, zoos typically hatch them in carefully controlled incubators, closely monitoring the temperature and humidity.