The black woodpecker and the boreal owl

"Although timid, the largest of the European peckers rarely gœs unnoticed because of its ""kraaak kraaak kraaak"" cries in flight often followed by a powerful ""zhreee"" when it lands. Black and the size of a crow, the male has a red cap covering the whole skull which is limited to the neck in the female. Seeking out old trees to dig its nest, its role is decisive for the boreal owl. This boreal forest owl cannot dig its own home in the wood, so it must use the old homes made by the black woodpecker."