On the reservoir of the Verbois dam, a strange floating neighborhood is preparing to welcome its seasonal residents. After spending the winter along the African coasts, common terns return each year to nest on artificial rafts specially designed for them. This discreet refuge is the result of several decades of human commitment and has become essential to the species’ survival.

But climate-related changes on Lake Geneva are forcing a small population of black-headed gulls to seek shelter on these already highly coveted platforms. As coexistence gradually seems to take hold, the Verbois colony is confronted with a series of events that put its fragile balance to the test.