I am single. We are plural

I'm a sheep and we are sheep and we are all together
We can flock and we can stray in very clement weather

I am single. Sheep are plural. I am on my own
keeping contact with the rest to make me feel at home

"Sheep may safely graze." It's clear, that here there's more than one
But add an 'a' and now we see the 'group effect' has gone

So here inside the world of sheep, it's really quite divine
that I am me and we are sheep and hence, we are ovine