Often brutal, always beautiful: the sea hounds of the Frisian Islands – in pictures | Netherlands

For 10 years, the scientist and photographer Jeroen Hoekendijk has been observing pinnipeds (seals, sea lions and walruses) on the fragile North Sea archipelago stretching along the Dutch, German and Danish coastline. A remainder of the now-drowned Doggerland, left behind after the ice age, the low-lying islands are an advance warning sign of the warming and rising seas of the climate crisis