My Mum used to sing the following...
The doo dah tree, the doo dah tree
The finest tree that you ever did see
Last July it grew so high
It poked a hole in the bright blue sky
Sailors say when their down that way
From two till half past three
On its branches big and strong
Prehistoric animals go shuff'ling
And they keep on climbing, climbing, climbing
Up the doo dah tree