Here's another version that I found on-line along with a sample of the melody. It's been done by many folk singers. Apparently, this version wasn't suitable for the sixties mass-market childrens shows.

http://www.hotsouptrio.com/Songs/AngusMcFergus.m3u

There was a wee squirrel who lived in an oak
He loved a good lunch and he loved a good joke
There's a wee bit of scotch in his family tree
He's Angus McFergus McTavish Dundee.

Of chestnuts and acorns he gathered a score
And, though he had plenty, he still gathered more
And he had them for lunch and he had them for tea
Angus Mcfergus McTavish Dundee.

His brothers and sisters and uncles and aunts (ants)
They all gathered 'round and they had quite a dance
And they flew through the air with hilarious glee
With Angus McFergus McTavish Dundee.

And while they were dancing a hunter came by
And of all of the dancers that hunter did spy
He raised up his gun and he aimed carefully
At Angus McFergus McTavish Dundee.

The rifle went off with a terrible blast
But Angus McFergus was faster than fast
And the bullet went deep in the poor old oak tree,
But, it never touched Angus McFergus Dundee.

I often imagine that I'd like to be, a bonnie wee squirrel
and live in a tree,
Pay no rent, and no taxes and get my lunch free
Like Angus McFergus McTavish Dundee.