Lamby Jokes

I don't know who to credit this to, but it was cute so I am posting it.
Mary had a little lamb,
Its fleece was slightly grey.
It didn't have a father,
Just some borrowed DNA.
It sort of had a mother,
Though the ovum was on loan.
It was not so much a lambkin
As a little lamby clone.
And soon it had a fellow clone,
And soon it had some more.
It made the children laugh and sing,
The teachers found it droll;
There were too many lamby clones
For Mary to control.
No other could control the sheep
Since their programs didn't vary,
So the scientists resolved it all
By simply cloning Mary.
But now they feel quite sheepish,
Those scientists unwary.
One problem solved, but what to do
With Mary, Mary, Mary?