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Some birds have a way of bringing out the worst in humanity. Perhaps it is an unconscious fear implanted by movies and literature. Take for example the Alfred Hitchcock movie "The Birds" and you get a sense of how ominous and even perhaps deadly some wild birds are to mankind. Look at what a flock of crows is called. It is called a murder. Certain birds have been associated with death and even as messengers of death. Perhaps it is just a bum rap but regardless, mankind has this fascination with anything avian.

The raven and the crow have definitely been portrayed in a bad light as the birds that you do not want to have around. Edgar Allen Poe turned the raven into a sinister messenger of doom with its cries of "nevermore." Readers have been fascinated with his portrayal of the raven. Even fairytales have plugged away at the image of the crow/raven. Take for example Disney's classic tale of "Sleeping Beauty." The villainess has a crow/raven that is used as her evil spy.

The wild bird definitely deserves some respect. It is just like other wild animal. You have to keep in mind that it is territorial, will defend itself and has to find a food source. And while crows/ravens have received some bad press thanks to authors and filmmakers, vultures and other carrion eating birds have repulsed mankind for eons. This bird species is a scavenger. Anytime you see vultures or buzzards circling in the air, you know that there is either something dying or something that has already died. Most people do not set up bird feeders to attract these types of birds. They want colorful birds, songbirds and delicate hummingbirds to grace their gardens and yards.

Perhaps it is time that people got over their fear of the birds that have gotten such a tough break in literature and movies. You do not have to worry about going outside and a murder of crows attacking you for no reason. The raven is not a symbol of death or a portent of bad things ahead. They are just two legged, winged wild animals that serve a specific function in the animal kingdom.

For some reason mankind is fascinated with birds. There are countless expressions based on birds. Phrases such as "this is for the birds" or even "swift as a bird" are quite common. Perhaps it is the sight of wild birds soaring through the skies that gives mankind the feeling that they have the best of it all. Even the term "bird's eye" is used so commonly that most people know what someone is referring to. But literally, the bird eye is something to envy.

The bird eye is quite similar to the human eye. It has many of the same working parts. The basic structures of a bird's eye are: eyelids, cornea, retina, anterior chamber, iris and lens. These are the same structures that a human's eye has but there are differences in how each works. The most obvious difference is that birds have larger eyes in comparison to the rest of their body. The starling's eye is 15% of its body. The human eye is 1%. Birds can see a greater area but often cannot move the eye itself.

The size of the eye depends on the bird species. Owls, for example, have huge eyes that allow them to take in more at once. For a wild bird that is important because it means that they can spot enemies and their prey much easier. Owls cannot move their eyes so they rotate their heads. How far do they rotate their heads? They rotate a whopping 200 degrees. Another difference to be found is the number of eyelids a bird has over humans. The human eye only has an upper and lower eyelid.

All species of birds have three eyelids. They have an upper, lower and a nictitating membrane that cleans and protects the eye. Another difference is in the positioning of the eyes. Humans and most wild animals, especially predators, have eyes that are not as centralized as a bird's eye. A bird's eye is on the front of the skull and they lack the ability to see very far to the sides. This is why birds turn their heads often.

Human's can get by without their eyesight. There are many devices and advancements in medical science that allow for humans to compensate for vision loss. Wild birds do not have this luxury. If their eyesight is damaged, then they will undoubtedly starve or die without outside help from a conservation or rescue group. The bird eye may just be an organ but it is one that these two legged, winged wild animals cannot live without.