One big hippo balancing

ONE big hippo balancing,
Step by step on a slippery rock,
He thought it was such tremendous fun
He called for another hippo to come.

TWO big hippos balancing,
Step by step on a slippery rock,
They thought it was such tremendous fun
They called for another hippo to come.

THREE big hippos balancing,
Step by step on a slippery rock,
They thought it was such tremendous fun
They called for another hippo to come.

FOUR big hippos balancing,
Step by step on a slippery rock,
They thought it was such tremendous fun
They called for another hippo to come.

FIVE big hippos balancing,
Step by step on a slippery rock,
But all of a sudden they fell into the mud,
And down came the hippos with a great, big thud...
In the mud!