same reason why people call a chair a chair
there is no plural for sheep 1 sheep is call a sheep and more than 1 sheep is call a sheep
a sheep
Flock of sheep
You would call someone who looks after sheep a shepherd.
what do you call it when the sheep all get stuck at a gate
Listening for predators, the call of their lambs and the call of other sheep.
This can be called a herd or a flock of sheep.
The collective noun for sheep is 'flock'.
A shepherd or a sheep-herder
Like here sheepy sheep
A group of sheep are a "herd".
A baby sheep is called a lamb.