The Yak

 Hilaire Belloc        

As a friend to the children

Commend me the Yak.

You will find it exactly the thing:

It will carry and fetch, you can ride on its back,

Or lead it about with a string.

The Tartar who dwells on the plains of Thibet

(A desolate region of snow)

Has for centuries made it a nursery pet,

And surely the Tartar should know!

Then tell your papa where the Yak can be got,

And if he is awfully rich

He will buy you the creature - 

or else

he will not.

(I cannot be positive which.)