I know Ed's version -- in fact I talked him into going to Aardvark Books in San Francisco and singing it with me. They said, "That was very nice. Now, don't do it again." Kids love it.

The Aardvark Song

It starts with an "A" (Aardvark, aardvark)
It ends with a "K" (Aardvark, aardvark)
Not easy to say (Aardvark, aardvark)
But try anyway (Aardvark, aardvark)
Eats ants everyday (Aardvark, aardvark)
At work or at play (Aardvark, aardvark)
You spell it this way: double "A"
"R-D-V-A-R-K" (Aardvark)

I don't know who wrote this gem. It may have been Ed himself.