European green woodpecker but is made sticky by secretions from the enlarged salivary glands. Heavy, prolonged snow cover makes feeding difficult for the green woodpecker and can result in high mortality, from which it may take 10 years for the population to recover. Ant nests can be located under the snow; one bird was observed to dig 85 cm to reach a nest. 'Professor Yaffle', the wooden bookend character in the 1974 children's animation series "Bagpuss", was based loosely upon the green woodpecker. 'Yaffle' was among many English folk names for the European green woodpecker relating to its laughing call; others include laughing
European green woodpecker gives a noisy "kyü-kyü-kyück" while flying. The song is a loud series of 10-18 'klü' sounds which gets slightly faster towards the end and falls slightly in pitch. The female makes a thinner "pü-pü-pü-pü-pü-pü-pü". The flight is undulating, with 3–4 wingbeats followed by a short glide when the wings are held by the body. It can be distinguished from the similar, but smaller, grey-headed woodpecker by its yellowish, not grey, underparts, and the black lores and facial 'mask'. In Europe, its green upperparts and yellow rump can lead to confusion with the grey-headed woodpecker or possibly the female golden oriole,