It is entirely natural for pine martens to take osprey eggs and the mammal is not a threat to the ongoing survival of the bird.
Their biggest problem has been people.
A shared history of human persecution
Ospreys and pine martens were both wiped out from vast areas of the country by the actions of people.
Ospreys were shot for taxidermy, or because they were seen as a threat to game. Collectors also took their eggs. Appallingly, they became extinct in the UK in 1916. The last pair nested on an island in Loch Arkaig.
The comeback began in 1954 when a pair settled to breed at Loch Garten in the Cairngorms. Now thanks to decades of work to reintroduce this magnificent bird and protect its habitat, we have more than 300 breeding pairs in Britain.
Although the pine marten was one of the most common carnivores in Britain, it is now one of the rarest. Their dramatic decline was caused by loss of habitat, the fur industry and predator control associated with game shooting. By the early 20th century, the species was close to extinction, surviving in just a few scattered pockets.