Beware earthlings, we are coming

An alien craft on a farm did land
With a cunning plan in mind
To eliminate all the earthlings here
And prepare earth for it's kind

As it aimed its death ray at the foe
It fell down to the grass
As a sheep came charging from behind
And rammed it on the ass

Then the pig that it was aiming at
Came and crapped upon its face
As the alien struggled hard to breathe
What was this awful taste

But the baby lamb that lay close by
Bit its ear and caused it pain
So the alien scrambled to its craft
And was never seen again

It radioed back to the invading force
Turn around, you must retreat
Cause' earthlings are so bloody fierce
And no way can they be beat

So next time you eat those bacon strips
Or a lovely leg of lamb
Be sure to think of the sheep and pig
Who foiled a cunning plan