- We know that all birds of prey are difficult to survive, even those born in the wild, but those released from zoos they have even more difficulty. These must learn to chase their prey and kill their prey, says Per Eriksson, head of research at the national museum.
Almost all deployed kids starve to death quickly, but a few survive anyway and now the researchers are going to find out if cubs from Märtas on Skansen have helped to improve the endangered rock uv.