Once Arden said, "Why is it that one sheep is called a sheep and multiple sheep are also called sheep? It should be shoop and sheep. Like, 'Oh, look, there goes a shoop,' and 'Wow, there goes a lot of sheep'."
--The Fire Stone

I'm the black sheep.

The mountain sheep are sweeter, But the valley sheep are fatter. We therefore deemed it meeter To carry off the latter. - Thomas Love Peacock,

A leap year Is never a good sheep year.

She walks--the lady of my delight-- A sheperdess of sheep. Her flocks are thoughts. She keeps them white; She guards them from the steep. She feeds them on the fragrant height, And folds them in for sleep.

It would be equally reasonable to say that sheep are born carnivorous, and everywhere nibble grass.