What is the last thing that goes through the mind of a fly when it hits a car window?
Yes, its ass.
Basically it is confusion. Have you ever tried to explain the concept of �window� to a very young child, or a cat or a dog? Now try it with a fly. See.
Flies have what is called compound eyes, which are composed of units called ommatidia. An ommatidium contains a cluster of photoreceptor cells surrounded by support cells and pigment cells. The outer part of the ommatidium is overlaid with a transparent cornea. Each ommatidium is innervated by one axon and thus provides the brain with one picture element. The brain forms an image from these independent picture elements. The number of ommatidia in the eye of the Diptera (generally the fly) is several hundred. Now, I don�t need to explain how difficult it is to get your key in the lock when you are seeing double after having several triples, so one can only imagine how difficult it is for a fly to find that space that looks like �the light� but is in fact both an opened and closed window. Give it up for the flies of our nation.