Eurasian nuthatch
The Eurasian nuthatch eats mainly insects, particularly caterpillar and beetles. In autumn and winter, the diet is supplemented with nuts and seeds, hazel nuts and beech mast being preferred. The young are fed mainly on the insects favoured by their parents, with some seeds. Food items are found mainly on tree trunks and large branches, but smaller branches may also be investigated, and food may be taken from the ground, especially outside the breeding season. Nuthatches can forage when descending trees head first, as well as when climbing. Some prey is caught in flight, and a nuthatch will remove bark or rotten wood to reach insects, although it cannot chisel into healthy wood like a woodpecker. A pair may temporarily join a mixed-species foraging flock as it passes near their territory. The Eurasian nuthatch readily visits bird tables and bird feeders in winter, eating human-made food items such as fat, cheese, butter and bread. It has even been recorded as taking slaughterhouse offal. Sizeable hard food items like nuts or large insects are wedged into crevices in tree bark and smashed with the strong bill.