My REALLY little pony: Einstein, the world's smallest stallion, gets set for first birthday

He may not be able to compete in the Kentucky Derby, but he is surely as popular as the winner.

And with appearances on Oprah and across the U.S. it has certainly been an eventful first year for Einstein, the world's smallest stallion, as he approaches his birthday.

Standing just 20inches tall, the horse attracted huge media interest when he was born in April last year.

Little and large: Regular-sized stallion Playboy stoops down for a closer inspection of his tiny cousin, Einstein 

Thousands queued at a farm in Barnstead, New Hampshire for a glimpse of him.

But while human interest was high, he didn't have many friends of his own breed.

Now his quest to find buddies and his life at home with owners Charlie Cantrell and Rachel Wagner in Gilmanton, New Hampshire, will be published in a new a book to celebrate his birthday.

'This has been a remarkable year for