Hard to believe, but I still remember the theme from the opening credits. Amazing, since it only aired a few times and hasn't been heard in 35 years. I tried to find the lyrics on the web, to no avail.
The only snippets of the lyrics I can recall are:
"The bird is very clever...
blah, blah, blah....
It knows how to feather its nest!"
And the lyrics ended with the name of the program.