Why do goats and sheep have rectangular pupils

Why do goats and sheep have rectangular pupils?
They don't need to look straight ahead:
there is grass ahead that you can eat without looking.
But lateral vision is extremely important.
Therefore, the eyes of the same goats and sheep are bulging, on
the sides of the head. A slit-shaped pupil makes
it possible to survey the surroundings.
The outlook of the goat is 340 degrees. She doesn't see
only 20 degrees behind her ears. Vision
in this case may not be the sharpest, but
the rectangular pupil reacts sensitively to
any horizontal movement.
Sheep and goats are herd animals. Even if one
individual manages to catch
the beginning of the predator's movement with his peripheral vision, from the spot
the whole herd is being removed. Rectangular
pupils have another feature. They
always remain horizontal
relative to the ground. That is, when a goat
or sheep chew grass, lowering their muzzle, they
do not look down.