Recently, thousands of tourists gathered on the beaches of Durban, South Africa, to watch the annual "Sardine Race". Every year from May to July, billions of sardines migrate north along the east coast of South Africa to the waters off Durban from the shoals of Cape Agares, africa's southernmost tip. Migrating schools of sardines are usually 7 km long, 1.5 km wide and 30 m deep, like a huge black ribbon fluttering in the sea. The large-scale sardine migration operation also triggered a spectacular hunting scene, the bottlenose dolphin in the sea, various sharks, anchovies and the air gannets, and other joint battles to encircle and suppress the sardines, so the whole migration is called the sardine race. (Reporter: Li Xiuli)
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