
The social orientation of Siamese cats may be related to their lessened ability to live independently of humans. Siamese coat colouration is appealing to humans, but is ineffective for camouflage purposes. They are less active at night than most cats, possibly because their blue eyes lack a tapetum lucidum, a structure which amplifies dim light in the eyes of other cats. Like blue-eyed white cats, they may also have reduced hearing ability. Therefore, being dependent on humans may have been a survival trait for ancestors of the Siamese.
Source : http://en.wikipedia.org/wiki/Siamese_(cat)
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