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
English folk music and therefore unworthy of attention. Some authors, however, find these distinctions more difficult to maintain. Although erotic songs became part of the standard fare in folk clubs and among folk rock musicians, relatively few of the more explicit songs have been placed on record. The hornpipe is a style of dance music thought to have taken its name from an English reed instrument by at least the 17th century. In the mid-18th century it changed from 3/2 time to 2/2, assuming its modern character, and probably reaching the height of its popularity as it became a staple of theatrical performances.