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The cat's clavicle, or collarbone, does not connect with other bones but is buried in the muscles of the shoulder region. This lack of a functioning collarbone allows them to fit through any opening the size of their head.

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The first formal cat show was held in England in 1871; in America, in 1895.

A cat has approximately 60 to 80 million olfactory cells (a human has between 5 and 20 million).