Too hot to incubate: Nile crocodiles hatch on their own in French reserve

France's heat waves have led to an extraordinary event at a wildlife park in Pierrelatte, where 10 Nile crocodiles hatched without human intervention for the first time. Typically, zoos incubate Nile crocodile eggs in controlled incubators, monitoring temperature and humidity meticulously. This natural incubation marks a significant event, with the reserve's director, Samuel Martin, highlighting it as a symptom of climate change.

Nile crocodile embryos need a constant temperature of 30°C–32°C (86°F–90°F) for roughly three months to develop and hatch. France experienced three summer heat waves, including the record-breaking 52 days of extreme heat, which created optimal conditions for these subtropical species to reproduce naturally. The sand in the nest retained the accumulated heat during the day, maintaining the necessary temperature.

All 10 hatchlings are in good health and will be closely monitored before their public debut. While these hot-weather conditions are favorable for Nile crocodiles, other species adapted to more temperate climates may have faced challenges due to the prolonged heat waves.