I can confirm that it was indeed Pete MacNab who wrote this song.
I know 'cause he's my big brother!!!
He came up to visit me at the time of the Glenfarg Village Folk Club's April Folk Feast three or four years ago.
The Folk Feast has a song competition each year and on this occasion the theme was anything to do with birds. (All money raised at the event was donated to a rescue centre for oil damaged sea birds)
He didn't win the competition but came second.
I know he's my brother and that I am bound to be biased but HE WAS ROBBED!!!
Most people, other than the judge, were of a similar opinion.
I don't have the words, but will get in touch with him and get them posted - It is one of the funniest songs he's written and he has come up with a few crackers over the years. (More than me - but thats because he's a LOT older than myself)
Dunc McNab