A beekeeper in La Roche-sur-Yon has found the perfect place for his apiary: the rooftop of a supermarket. It's a win-win situation: the store manager helps the beekeeper with his production in return for a steady supply of local honey.

In part seven of this episode on the ecosystems, the young students are on a field trip (a marsh trip to be exact), where they witness firsthand the destruction of this precious ecosystem. But this is not a new phenomenon: once upon a time in Polynesia...