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Cats have about 130,000 hairs per square inch (20,155 hairs per square centimeter).

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.

A tomcat (male cat) can begin mating when he is between 7 and 10 months old.