The hare can see not only what is ahead, but what lies behind. Therefore, it is impossible to sneak up, not scaring him. But the hare hard to see close objects. For this he has to turn his head.
Eyes of insects located on the sides of the head are composed of many small holes - ommatidial. These eyes are called compound. Each of ommatidia transmits to the brain only one point from the picture of the world surrounding the insect. Many individual points as seen by each of ommatidia, in the brain of an insect is composed of a mosaic "picture" objects of the landscape.
The sight of bees is in a different range compared to human vision. They respond well to UV rays and didn't see the red part of the spectrum.
The dove has a unique ability to look for a long time directly at the sun. The retina is not afraid of even the laser beam with energy up to 0.05 Joule per pulse!
Frog manages not to see what she is seeing is not necessarily. For instance, she doesn't notice the shadow from the clouds. But important information is immediately captured by the eye and immediately transmitted to the brain. This information about moving objects - potential prey. In addition, the retina of the frog has the ability, if necessary, to enhance the image contrast, especially clearly outlining its contours. Of course, this system also has negative sides: because the information is not processed in the brain of the frog, and immediately calls to action, the frog is often wrong: the lack of any moving objects, if they are small and rounded, even if it's not food. However, grasping the subject, caught up inedible, the frog immediately spits it. But interestingly, it does not "upset" from his miss: her brain simply does not react to it, does not fix the failure, the frog does not remember what happened a second ago. It will again be looking at moving objects, catching them unaware fixed.