You can see a video of John Denver singing TOOLS at YouTube, in an excerpt from a 1973 TV show. TOOLS also appeared on Denver's album "Aerie" (1971). These are the words he sings in the video:

Tools was baby rabbit. He was a friend of mine.
His mama and papa, and brothers and sisters left him all behind.
He came into our house to brighten up a couple of days
Tools, you made me smile a lot and I wish you could have stayed.