The majority of woodpeckers are sedentary but there are a few examples of migratory species such as the rufous-bellied woodpecker and yellow-bellied sapsucker,[REF] and the Eurasian wryneck, which breeds in Europe and west Asia and migrates to the Sahel in Africa in the winter [REF].
The Swiss Ornithological Institute has set up a monitoring program to record breeding populations of woodland birds.