Whip-Poor-Will
(source: "Our Chalet Songbook", Our Chalet Committee, 1981; also found in "Girl Guide Songbook, Vol. 2", Girl Guides Association, 1984 and "Songs for Canadian Girl Guides", Girl Guides of Canada, 1981.)
(can be sung as a 3-part round)

Gone to bed is the setting sun.

Night is coming and day is done.

Whip-poor-will, whip-poor-will has just begun.