Birds are beautiful creatures of nature. People have long been jealous of their ability to fly, but birds have another feature that a person could admire. This is their amazing vision.
Instructions
Step 1
Vision plays a huge role in the life of birds. Many birds have to simultaneously track down their prey and watch carefully so that they themselves do not become someone's dinner. Others look for their victims on the ground, themselves at this time being high in the sky. Still others are nocturnal and can see perfectly in the dark. Therefore, in the course of evolution, vision in birds has developed much better than in humans.
Step 2
Birds see four to five times sharper than humans. In most species, vision is monocular (with the exception of owls) - that is, they perceive an object mainly with one eye. But the field of view itself is much wider than that of humans, and is about 300 degrees. Such a view is achieved due to the location of the eyes - in birds they are on the sides. And the structure of the nightjar's visual organ allows him to see 360 degrees without turning his head at all.
Step 3
A person has a yellow spot in the middle of the fundus - the place where the maximum concentration of cells that are sensitive to light is observed. Birds have two such spots. Therefore, they can simultaneously consider two objects of interest to them, located at a distance from each other.
Step 4
Some birds' eyes can work like a real spyglass. Predators - condors, vultures, eagles - have to look out for their prey from a great height. In order to better see the victim, in the course of evolution, they developed an interesting adaptation. Their central visual bundle is able to magnify the image by two and a half times.
Step 5
Nocturnal birds have their own devices that allow them to see in the dark. At the bottom of the eyeball of owls and eagle owls, behind the retina, there is a reflector layer. It is capable of capturing weak stray light. The eyes of owls, unlike other birds, are located in front, and their eyeballs are firmly fixed, which significantly narrows their viewing angle. But owls managed to solve this problem by learning to turn their head 360 degrees.
