In Marseille, strange marine animals cascade onto the beaches. Millions of azure-blue velelles have invaded the shores of the Phocaean city.

The arrival of unstable weather, violent winds and strong currents have got the better of millions of them in recent days. “I have never seen this in 30 years. The unpredictability of the weather is the cause of strong sea currents,” explains Didier Réault, president of the Calanques National Park.