If you want to see the sheet music (lead sheet) from Jacobite Relics, it's here.

Spotify has recordings by:
Alastair McDonald, on "Bonnie Prince Charlie" and "I Dearly Like the West"
Heather Heywood, on "Some Kind of Love," "The King Has Landed," and "Songs of Scotland"
Jim Reid, on "Yont the Tay"
Martin Carthy & Eliza Carthy, on "The Moral of the Elephant"
Peggy Seeger & Ewan MacCol,l on "Songs of the Two Rebellions"
Steeleye Span, on "Parcel of Rogues"
The Corries, on "Stovies"
and a few others.

By searching for "moorhen" you can also find the sound of the actual bird.