Most animals in nature have round eyes. Why are goat's eyes square?

Advantages of sheep's square pupil When the sheep's pupil is enlarged, its shape is rectangular, so it has a wide peripheral field of vision. Sheep have a wide viewing angle, 270-320 degrees, and goats have a viewing angle of 320-340 degrees. Animals with rectangular pupils can see more clearly at night because of their larger pupils, and they can better avoid light when sleeping during the day because their eyes are closed more tightly. The position of sheep's eyes is biased to the sides of the head, which makes its vision wide. This position and structure of sheep's eyes is the result of its evolution as prey.

There are two kinds of goats, such as antelope, with big horns and curved horns. One has a big horn and a ring, and its meat weighs 100 kilograms. A thin angle. Its horns are so big that they sometimes fall off. In summer, dust is exposed and grass grows on it.

Goats have strong foraging ability and miscellaneous eating habits. They can eat white grass, various grasses, shrub branches and leaves, crop straws, vegetable leaves, peels, vines and agricultural and sideline products. And they eat a wider variety of plants than other livestock. Goats are brave, lively, agile and witty. They like climbing mountains and are good at swimming. They belong to lively little ruminants and love to fight.

Goats live in groups. Regardless of grazing or house feeding, goats always like to walk together, among which the older, more offspring and strong sheep play the role of "head sheep". Under the leadership of the first sheep, other sheep can only obediently eat grass, get in and out, get up, cross the bridge and cross the narrow place. Sociality provides convenience for large-scale grazing of goats.

Sheep basically live in mountainous areas and often move up and down at high speed, so sheep need to be very sensitive to vertical movement, so they choose transverse slit pupils.