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Cats are the only animals who walk directly on their claws, not on their paws. It would be like humans walking on the tips of their fingers. Getting around on tiptoe, called digitigrade, is a particularly useful feature when it comes to moving at high speeds. Being the great hunter that they are, they need to keep this skill very sharp. Contrary to popular belief, manicuring their nails on furniture is not out of malice or sharpening the claws. Cats are tearing off the ragged edges of the sheaths of their talons when scratching. All year long, they shed their claws to expose new sharp ones beneath. Claws aren't just for protection. They are responsible for the cat's exquisite balance and amazing feats such as climbing, stretching, running, and grooming.

Cats (big and small) are the only animals who purr. Contrary to popular belief, purring isn't speaking. The purr comes from two membrane folds, called false vocal cords, that are situated in the larynx behind the actual vocal cords. Cats purr 26 cycles per second, the same as an idling diesel engine. Cats purr both when inhaling and exhaling, keeping the mouth completely closed. Scientists believe purring is produced by blood in a large vein in the chest cavity that vibrates and is then magnified by air in the windpipe. Kittens are born blind and deaf, but the vibrations of their mother's purring is a physical signal that the kittens can feel. It acts as a homing device, signaling them to nurse. Kittens begin purring at about one week old; then it's a signal to the mother cat that they're getting their milk and are content. Since purring is non-vocal, it doesn't interfere with the suckling. Contrary to another popular belief, cats don't purr purely for pleasure. Be alert: a deep purr can indicate that a cat is in pain or distress. Female cats will purr when in labor. Cats may purr in fear or anxiety. They will also purr in anticipation of being fed or stroked. Big African cats only purr in short bursts, but the house cat can purr for hours. Curiously, scientists tell us that a cat never purrs when alone.

That loud purring followed by the sharpening of claws on some soft spot of your body is called "milk-treading." When you relax and sit quietly, you're giving your cat the same signal he got from his mother when he was a kitten - that his mother was ready to let him suckle. A nursing kitten instinctively uses his paws to draw out the milk, gently pushing on his mother's stomach to increase the milk flow. When older cats behave this way, it's a good sign that they're happy, content, and probably recalling their kittenhood.

Always remember that cats with more dominant personalities may display varying degrees of aggression, while more timid ones usually hide or be somewhat aloof.