Tens of thousands of islands lie between Estonia and the Finnish Archipelago Sea. On Saaremaa, the largest Estonian island, nasal sounds resound across the island in autumn: they are the mating calls of moose. At the beginning of March, nature filmmaker Christoph Hauschild shoots the grey seals' nursery on two small islands in the Bay of Riga - never before has a camera crew been allowed to set foot on these islands. Only 200 kilometres to the west is Gotland, Sweden. Many animals and plants that are otherwise only found in southern Europe can be found on the second largest island in the Baltic Sea. 300 kilometres further north lies Finland's Archipelago Sea. A world of 80,000 islands. Europe's largest predator also lives in this labyrinth: the brown bear...