because they are square
They are rectangular.
Yes, and only a few species have rectangular eyes. Sheep, Goats, Octopuses and Toads have these rectangular shaped pupils. Typically classified as prey, these animals need to have a defense both day and night. But they don't have vertical slits due to their need to survey their surroundings more accurately. The narrower the pupil in relation to the horizon, the greater the accuracy of depth perception is in the peripheral vision of the animal. The perception of depth must be considered with these animals who spend their time evading predators in a rugged terrain. From The Evolution of The Rectangular Eye http://www.science20.com/variety_tap/evolution_rectangular_eye
Sheep and goats have horizontal, oval pupils.
The pupils rectangular shape helps the horse veiw the horizon for possible predators, which is what has kept them alive all this time.
Maltese painted frogs can have triangular shaped pupils. Please see the related link for more information...
They are rectangular.
because they are square
No, their eyes are round, however, the pupils in their eyes are rectangular.
Goats, sheep, cattle and horses.
Goats. Also octopi. But octopi aren't mammals. Right?
Yes, and only a few species have rectangular eyes. Sheep, Goats, Octopuses and Toads have these rectangular shaped pupils. Typically classified as prey, these animals need to have a defense both day and night. But they don't have vertical slits due to their need to survey their surroundings more accurately. The narrower the pupil in relation to the horizon, the greater the accuracy of depth perception is in the peripheral vision of the animal. The perception of depth must be considered with these animals who spend their time evading predators in a rugged terrain. From The Evolution of The Rectangular Eye http://www.science20.com/variety_tap/evolution_rectangular_eye
no
Goats have retagular shaped pupils.
No. They have rectangular pupils like a goat, horse, or cow would, not square.
Sheep
Animal pupils come all different shapes and sizes. A cat has slit shaped pupils, and a chicken has round pupils. Some goats even have time glass shaped pupils. Many different shapes.
They are in little rectangle shape. It may be why they are associated with the devil.