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The Amazing Sensitive World of Cats

By: Virginia Wells

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Leonardo da Vinci called them "Nature's Masterpiece." In ancient Egypt they were worshipped as gods and goddesses of the sun and moon, and killing them was a crime punishable by death. Cats are clean and have been praised for their mysterious, exotic looks. They are fun to watch, whether they are stalking a toy, your ankles or a snack. And they are noted for their keen senses: their sharp hearing, sense of smell and touch, and the ability to see in near darkness.

Your cat's senses evolved from those of the wild cat's, a long line of hunters and predators, and are designed for the purpose of stalking, hunting and killing. Almost all of your cat's five senses have heightened ability when compared to humans.

Scent Savvy

The first thing your cat does when he climbs onto your lap is smell – your lap, your hands, your clothing. Before he digs into his food, he will sniff it; before he takes a treat, he will sniff it. And have you ever tried hiding medicine in his food? I'll bet it was a solitary object lying in the bowl after he finished.

Your cat's sense of smell is superior; it is one of the ways in which he interacts with his environment. His nostrils are working constantly. His nose is small and neat, but hidden behind it is a maze of bones and organs. Cats have 19 million odor-sensitive cells in their noses compared to 200 million in dogs and about 5 million in humans. In the roof of the mouth is a taste and smelling organ called the Jacobson's organ, a tiny cigar-shaped organ that links the senses of taste and smell. He uses it to sniff out things like a potential mate, a strange cat in his territory or an unusual odor.

Cats are equipped with glands that secrete pheromones, which are identifying scents akin to fingerprints in humans. These glands are found on your cat's cheeks, on his lower legs, and under his tail. He deposits his scent marks as he walks, when he rubs his cheeks against something or when he sprays. Another cat will identify these scents and will gather information, such as the identity of the cat (if it's one he knows), when he was there, which direction he headed, and even what kind of mood he was in.

Seeing Stars

Keeping in mind that your cat evolved from hunters, you can understand why his sense of sight is one of his strongest. He can scan your backyard with a single sweep of his eyes and detect the tiniest of movements from the tiniest insect. He can see in the dimmest of lights; his eyes can open about three times as wide as the human pupil and let in as much light as possible at the normal "hunting" times of dawn and dusk. He also has about three times as many rods (the receptors that are sensitive to light) than we have.

But letting enough light into the eye is not enough; your cat's beautiful eyes also have a reflective layer at the back called the tapetum ludium. This accounts for the reflective glow you see when your cat's eyes reflect light. Also, to make sure his sensitive system isn't a problem during the day, he can shut his pupil size down to a fine vertical slit so that only a small amount of light enters the eye. His retina is limited in size and by giving more space to rods than cones (the cells that recognize color), he probably sees some blues and greens but not reds – they probably look gray.

A final protection is the third eyelid – a thin fleshy membrane that is usually tucked away at the corner of the eye, but that can be used rapidly for protection. It reduces the intensity of bright light, affords some protection from eye damage in a fight or in pushing through prickly undergrowth, and it helps to clean the eye. You might see it when your cat isn't feeling well.

Hearing Aids

Your cat is sound asleep in the back room of the house when you open a can of soda. Nothing happens. Later, you open up a can of cat food. Suddenly your kitty is there, stretching and looking sleepy and hungry.

A cat's sense of hearing is amazing. Cats can hear high frequency sounds we cannot. The upper range of hearing in cats is about 60 to 65 kiloherz, which enables them to hear both their kittens and the ultrasonic calls of rodents. They can also distinguish the tone or pitch of sounds better than we can. And their ability to locate the source of a sound is highly advanced. From a yard away, a cat can distinguish between sound sources only 3 inches apart. They can also hear sounds at great distances – four or five times farther away than humans.

Cats can also detect the tiniest variances in sound, distinguishing differences of as little as one-tenth of a tone, which helps them identify the type and size of the prey emitting the noise. It also helps them distinguish the sound of your opening a can of soda from the sound of your opening a can of cat food.

Observe your cat as he listens to something. His ears move back and forth, functioning like mini-satellite dishes as they rotate to pick up the sounds and funnel them to the brain. The external ear, or pinna, contains more than 12 muscles, which allows the ear to turn, rotating up to 180 degrees to locate and identify even the faintest of squeaks, peeps or rustling noises.

Touch of Cats

You may have noticed as you pet your cat, he turns into an "id," demonstrating nursing behavior like drooling and treading – behaviors normally performed by kittens to stimulate milk flow. These are pleasurable memories from kitten-hood. When you stroke your cat, he, in fact, regresses to behave as he did when his mother groomed him. It was her touch that was the primal source of affection, and your cat substitutes you for his mother when he licks or kneads you.

Cats can feel their way around because of their highly developed sense of touch. Their skin is covered with highly sensitive "touch spots," which respond to the lightest pressure. Add to that their whiskers and eyebrows and the group of long hairs in the back of their forepaws that all transmit pressure sensations to the brain.

It's said that if a cat's whiskers touch a mouse in the dark, the cat reacts with the speed and precision of a mousetrap. The whiskers are the most sensitive of all and play a vital part in his survival. The special hairs, called the vibrissae, are set deep within the skin and provide the cat with sensory information about the slightest air movement around it – a valuable tool for a nocturnal hunter. Whiskers also help a cat navigate at night and help him determine whether he can fit through small spaces.

Taste of Tabby

You buy a new cat food, a "delicacy" as the ads say. You open the can (your cat comes running) and place it in his dish before him. He takes a quick whiff, turns and walks away – without even a taste.

In spite of their reputation for being finicky when it comes to food, cats have less ability to differentiate among tastes than humans; we have 9,000 taste buds, while cats have only 473. Your cat's taste buds are found in the mushroom-shaped papillae at the tip and sides of his tongue and in cup-shaped papillae in the back of his tongue. However, they make up for this deficiency with a superior sense of smell, and his most powerful response to food is through that sense of smell, not taste.

Your cat's taste will respond not only to flavor, but also to food's texture and temperature. Food that is not room temperature is a turnoff to most cat's and may be the result of his ancestor's natural predilection for eating recently killed prey.

Making Sense

Cats can hear sounds we can't hear, see things we can't see and smell and feel the world around us in ways that we could never grasp. These remarkable abilities are part of the evolutionary adaptation to the role of solitary nocturnal hunter. Overall, the predatory instinct plays a large role in your cat's behavior. Properly channeled through play and exercise, it makes for an interesting and exciting relationship with your pet.

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