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

For 10 years, the scientist and photographer Jeroen Hoekendijk has been observing pinnipeds such as seals 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

• Photographs by Jeroen Hoekendijk, text by Philip Hoare