Snipe often making a winnowing sound when they are flying around. I know (having had the album in question) that the lyrics are printed on the sleeve, but in most cases they are probably penned by someone other than the artist who is simply guessing at what they are, when in doubt.
"Where no track's on the bog they are flying:"
should be
"Winnow tracks on the bog they are flying:"
Snipe often making a winnowing sound when they are flying around. I know (having had the album in question) that the lyrics are printed on the sleeve, but in most cases they are probably penned by someone other than the artist who is simply guessing at what they are, when in doubt.