Animal sight is much different from humans. Milwaukee area residents can see this in their neighborhoods since many wild species live in the same area.
Dogs and cats see color spectrum from dark brown to light yellow and light blue to royal blue. Some are color blind but they have very sharp peripheral vision. Their eyes are extremely sensitive to movement in the dark. They use both eyes to focus on an object like humans.
Snakes have poor vision using heat sensors on either side of the nostrils called piths.
Equines and assines have eyes set on the side of their heads. This allows them to see almost 360 degrees. They have two blind spots that are two feet directly behind them and directly in front of them. They can see in minimal light.
Insect vision varies from species to species. Some see much the same spectrum as dogs and cats and others see ultraviolet light. They have compound eyes with many lenses that form a honeycomb design.
Crustaceans have very poor eyesight. However, the mantis shrimp is the exception having twelve types of photoreceptors, humans have three.
Birds have excellent eyesight. Birds of prey are farsighted and have their eyes set forward on the face. Many birds that are awake during the daylight hours can see ultraviolet light.
Sharks have excellent vision because they have an extra layer of crystalline tissue called a tapetum lucidum. They can see ten times better under water than humans.
A nocturnal animal usually has very large eyes and an animal who is awake during the day has smaller eyes.
Sight in the animal kingdom is quite various and can be seen at the Milwaukee County Zoo