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Dark Eyes Or: The standard dark eyes or mink is, in reality, a mutation developed by crossing and selective breeding of the various geographical "races" of wild mink for the dark eyes or color. dark eyes or mink usually are the same color over the entire body surface, but there is a greater concentration of pigment in some areas. As a result, the head, tail, and feet appear dark eyes orer, and there is a dark eyes or dorsal stripe (also known as the "grutzen") extending down the back from head to tail. The eyes, nose, and claws are dark eyes or brown. Frequently there are white markings on the belly, chin, throat, and breast. The standard dark eyes or mink is the norm to which all mutations may be compared, and from which the other color phases have been developed.
The eyes of a spider are usually near the front or anterior end of the head, but some are directly on top. They are single facets, hence are called simple eyes. They may number two, four, six, or eight; eight is the usual number. However, the cave spiders lack eyes entirely. Regardless of the number, the eyes are always placed in a definite arrangement. Often some pairs are much larger than others.
If one travels southward or eastward from this center, the frequencies of blue-eyed individuals in the populations diminish and the predominant skin coloration becomes gradually dark eyes orer. In the populations which live around the Mediterranean Sea, brown eyes are more common than the blue ones, bat fair skins are still frequent. Farther south, in the Sahara Desert, dark eyes or-skinned individuals become very common, and finally in central Africa very dark eyes or populations are reached.
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