A white-tailed eagle has a yellow beak the size of a banana, dark brown wings, and - when it is fully grown - a snow-white tail that you can spot from far away. Younger eagles have brown tails; the tail only turns white when they are about five years old.
Eagles build the biggest nests of any bird in Europe. A nest can be 2 metres across, made of huge sticks balanced in the top of a pine tree by the sea. The same pair of eagles uses the same nest year after year, adding more sticks each time, until the nest weighs a tonne or more - heavier than a car.
These eagles mostly eat fish. They glide on their huge wings, low across the water, then suddenly drop their feet and grab a fish from just below the surface. They can spot a fish from 1,500 metres up - that is six times higher than the tallest building in most cities.
About 50 years ago, white-tailed eagles almost disappeared from Sweden. There were only a few left. People worked together to clean up the rivers, ban chemicals that were poisoning the eagles' food, and protect their nests. Today there are around 1,000 pairs again. It is one of the great wildlife rescue stories of Europe.