Cat

• 1. Introduction

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  The cat, Felis catus, numbers somewhere between 200 million and 600 million individuals worldwide, and nobody can pin the count down further because millions of them roam free with no owner at all. It is a solitary hunter with retractable claws built for killing mice, a body tuned to detect the faintest movement in near darkness, and the only domesticated member of the entire cat family, Felidae. It still carries nearly the whole toolkit of a wild predator, from stabbing canine teeth to a righting reflex that lets it land on its feet after a fall. How did an animal built for solitary ambush become the world's favorite pet? What does its body, still shaped for stalking prey, reveal about a creature that never fully left the wild behind? And what happens when that hunting instinct is set loose on ecosystems that never evolved to face it?

• 2. Built For The Hunt

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  An adult domestic cat typically weighs 4 to 5 kilograms and measures about 46 centimeters from head to body, with a tail adding roughly 30 more. Males run larger than females. Beneath that frame is a spine built for flexibility rather than endurance: cats have 13 thoracic vertebrae to a human's 12, seven lumbar vertebrae to a human's five, and a variable run of caudal vertebrae down the tail, where a human has only a fused, vestigial coccyx. That extra length in the spine gives the cat its signature suppleness. Its forelimbs are attached to the shoulder by free-floating clavicle bones, unlike a human arm, which lets a cat squeeze its whole body through any gap its head can fit through.

  The skull carries oversized eye sockets and a jaw built around two long canine teeth, which can slide between two of a prey animal's vertebrae and sever its spinal cord outright. Behind those canines, a premolar and a molar on each side form a carnassial pair that shears meat the way a pair of scissors would, because a cat's back teeth cannot actually chew. Despite living on meat, cats tend to have better dental health than most humans, thanks to a thicker layer of enamel and a diet mostly free of sugar.

  The claws stay sheathed against the toe pads until a cat chooses to extend them, for hunting, climbing, or gripping a surface, which keeps them sharp by sparing them contact with the ground. Most cats carry five claws on the front paws and four on the back, plus a raised dewclaw and, further up the wrist, a strange sixth-finger-like protrusion thought to work as an antiskid device during jumps. Some breeds develop extra digits altogether, a trait called polydactyly.

  On the move, a cat is digitigrade, walking on its toes with a pacing gait that swings both legs on one side forward together, a technique that lets a hind paw land almost exactly where the corresponding forepaw already stepped, muffling both sound and tracks. Speed up to a trot and the gait switches to a diagonal pattern instead. A cat can fall from as high as 3 meters and land on its paws using the righting reflex, and it has enough time to complete that twist in any fall of at least 90 centimeters, a phenomenon researchers have studied under the name "the falling cat problem."

• 3. Senses Beyond Our Own

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  A cat can see at one sixth the light level a human eye needs, largely because of a structure called the tapetum lucidum, which bounces light that has already passed through the retina back through it a second time. Its pupils are vertical slits that let it focus bright light without distortion, and in dim conditions they widen to cover nearly the whole visible surface of the eye. Color is a weaker sense: cats have only two types of cone cells, tuned to blue and yellowish green, so their ability to tell red from green is limited. A nictitating membrane lets a cat blink without ever losing its view of a scene.

  Hearing runs from about 55 hertz up to 79 kilohertz, a range that dwarfs the human span of 20 hertz to 20 kilohertz, and it lets a cat pick out the ultrasonic calls of rodent prey that a human would never register. Large, independently movable outer ears, the pinnae, help pinpoint exactly where a sound is coming from, and researchers have found that cats can build mental maps of familiar people's locations just from the sound of their voices.

  The nose carries a well-developed olfactory bulb and about 5.8 square centimeters of scent-detecting tissue, roughly double the surface area found in a human nose. A separate structure, the Jacobson's organ in the roof of the mouth, lets a cat register certain aromas through a curled-lip behavior called flehmening. That sensitivity extends to nepetalactone, the compound in catnip, which cats can detect at concentrations below one part per billion; somewhere between 70 and 80 percent of cats respond to it, and the same reaction shows up with silver vine and valerian.

  Taste tells a different story: cats carry roughly 470 taste buds against more than 9,000 on a human tongue, and a shared mutation in domestic and wild cats alike leaves them with no ability to register sweetness at all. What they do have is a distinct sensitivity to umami, built around detecting inosine monophosphate and histidine rather than the glutamic and aspartic acids humans respond to, molecules that happen to be especially concentrated in tuna. One researcher studying the effect put it plainly: umami, for a cat, may matter as much as sweetness does for a person. On top of taste and smell, a cat reads its surroundings through dozens of whiskers concentrated on the face, which sense the width of gaps and the presence of objects in total darkness and trigger a reflexive blink before anything can touch the eye.

• 4. From Wildcat To Housemate

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  Carl Linnaeus proposed the scientific name Felis catus in 1758, and nearly 250 years later, in 2007, genetic sampling of the modern domestic cat traced its likely descent to the African wildcat, Felis lybica. The domestication process itself began far earlier and far from Egypt, where it was long assumed to have started. The earliest solid evidence for a tamed African wildcat instead comes from Shillourokambos in southern Cyprus, found beside a Neolithic human grave and dated to roughly 7500 to 7200 BCE. Because Cyprus has no native mammal fauna of its own, researchers believe the villagers there carried the cat over from the West Asian mainland deliberately.

  The likeliest draw was the house mouse, which would have swarmed the grain stores of early Fertile Crescent farmers and pulled wildcats into their settlements in pursuit of it. Cats reached Greece by around 1200 BCE, carried onward by Greek, Phoenician, Carthaginian and Etruscan traders, and were a familiar sight around settlements in Magna Graecia and Etruria by the 5th century BCE. Rome carried the cat further still, into Corsica and Sardinia, and by the fall of the Western Roman Empire in the 5th century CE, cats descended from the Egyptian lineage had reached a port on the Baltic Sea in northern Germany.

  A second, independent domestication took place separately in China around 5500 BCE, when a different species, the leopard cat, was tamed there. That line left no trace in the cats alive today. Modern cat breeds only began to take shape in the mid-19th century, built almost entirely from random-bred domestic populations, and the genetic diversity among them is lowest in purebred lines, some of which now carry more than 20 known deleterious disorders.

  The word itself traces to the Old English catt and the Late Latin cattus, first recorded at the start of the 6th century, possibly borrowed from an unidentified African language or filtered down through Germanic and Uralic roots. An adult male is a tom, or a gib once neutered; a female is a queen; a young cat is a kitten. A group of them can be called a clowder, a glaring, or a colony.

• 5. Voices And Bonds

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  A raised tail signals a friendly greeting; flattened ears signal hostility; and among cats, the ones that outrank others in a group's hierarchy raise their tails less often than subordinates do. Purring itself likely began as a signal between a nursing mother and her kittens, a way for kittens to solicit care, and adult cats keep using it afterward as a sign of contentment during petting or relaxation. The mechanism runs through the glottis, which snaps open and closed roughly 25 to 33 times a second under control of the laryngeal muscles, producing the sound. Researchers studying cats in rescue facilities have catalogued 276 distinct facial expressions built from just 26 underlying facial movements, and a five-point scale built on ear position, eye tightening, muzzle tension, whisker change and head position now helps detect pain in cats that cannot otherwise say so.

  Feral colonies form around co-operating groups of females sharing a food source, with one cat usually dominant over the rest, and each cat holding its own territory marked by urine spraying, facial rubbing and defecation. Sexually active males claim territories about ten times larger than a female's and often overlapping several of them. Around humans, the relationship can shift into something closer to a mother-infant bond: a cat's owner effectively functions as a surrogate parent, and a cat's high-pitched vocalizations can mimic the cry of a hungry human infant closely enough that people struggle to ignore them.

  Grooming absorbs a large share of a cat's day. Its tongue is covered in backward-facing spines about half a millimeter long, called filiform papillae, stiffened with keratin, which work like a built-in hairbrush; long-haired cats in particular sometimes regurgitate the resulting hairballs, 2 to 3 centimeters long, after enough fur collects in the stomach.

  A cat's cerebral cortex holds around 250 million neurons, and its memory can hold information for a decade or more, often tangled together with emotion so that a cat recalls a place alongside how it felt there. Kittens learn to stalk and capture prey partly by watching their mothers and partly through play itself, which mimics hunting closely enough that cats favor toys resembling small, fast-moving prey and lose interest once they've grown used to one. A swallowed length of string, though, can lodge at the base of the tongue and migrate into the intestines, turning a toy into a medical emergency.

• 6. Hunting, Diet And Mating

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  A cat's cheeks are not built to draw liquid up by suction, so it laps at a rate of about four times a second, touching the smooth tip of its tongue to the water's surface and retracting it like a tiny corkscrew to pull water upward into its mouth. As an obligate carnivore, a cat cannot survive on a diet built the way an omnivore's is: it cannot convert carotenoids into vitamin A, cannot synthesize enough vitamin D or niacin on its own, and cannot make cysteine, citrulline or methionine internally. A single meal lacking arginine can be fatal, and a diet chronically short of taurine causes dilated cardiomyopathy, a heart condition that was common in commercial cat food until a 1987 study traced it to taurine deficiency. Most adult cats are also lactose intolerant, which makes the old idea that cats should be given milk a genuine health risk rather than a treat.

  In the wild, or in a feral state, cats hunt in one of two ways: stalking prey actively or waiting in ambush outside a burrow, choosing the strategy based on what's actually available to catch. In the United States alone, domestic and feral cats are estimated to kill between 1.3 and 4.0 billion birds and between 6.3 and 22.3 billion mammals every year. In one English village, 30 percent of house sparrow deaths were linked directly to cats, and in Britain, cats accounted for 31 percent of ringed robin and dunnock deaths. Why a cat brings a dead animal home to its owner remains only partly understood; one theory holds that cats treat humans as members of their social group and share kills the way they would with a colony, and the fact that males, who take little part in raising kittens, do this too complicates simpler explanations.

  Male cats fight far more often than females, usually over the right to mate with a female in heat, with the heavier male typically winning. During mating itself, the female first rejects the approaching male before eventually allowing him to mate, and she lets out a loud yowl as he withdraws, because his penis carries roughly 120 to 150 backward-pointing spines about a millimeter long that are thought to trigger ovulation on withdrawal. Because ovulation isn't always triggered by a single mating, a female that mates with more than one male during a single heat can produce a litter with more than one father. Gestation lasts an average of 65 days. In a study tracking 2,300 free-ranging queens between 1998 and 2000, litters averaged three kittens each, with an average of 1.4 litters produced per year; of 169 kittens tracked, 127 died before six months old, mostly from dog attacks and road accidents. Kittens are weaned at six to seven weeks and are typically ready for a new home at about 12 weeks.

• 7. Health, Care And Numbers

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  The average lifespan of a pet cat has climbed steadily: about 7 years in the early 1980s, up to 9.4 years by 1995, and roughly 13 years as of the 2010s and 2020s. A 2024 study found that neutered cats live about a year longer than cats left intact, though neutering also slows metabolism and increases food intake, which can push a cat toward obesity. Only 28 percent of American veterinarians surveyed recommended neutering before four months of age, out of concern for effects on metabolism and bone growth; roughly 80 percent of household cats in the United States are neutered regardless.

  About 250 heritable genetic disorders have been catalogued in cats, many close enough to human inborn errors of metabolism that the same genetic tests originally built for humans can diagnose them in cats too. Accidental poisoning is common, and the list of hazards is long: lilies, tulips and philodendrons among plants; human medications such as acetaminophen and aspirin; and foods including grapes, onions, garlic and chocolate. Guidelines from groups such as the American Society for the Prevention of Cruelty to Animals and the American Association of Feline Practitioners recommend at least one veterinary check-up a year, along with private resting spaces, multiple feeding and litter stations, and regular play that mimics hunting; even so, in one survey only about half of cat owners reported playing with their cats daily, and between 50 and 90 percent of cats will develop dental or gum problems over their lives.

  The domestic cat now lives on every continent except Antarctica and on 118 of the world's 131 major island groups, a spread that has made it one of the world's most invasive species. Estimates of the feral population in the United States alone range from 25 to 60 million. Feral colonies around the Colosseum and the Forum Romanum in Rome have become famous, sustained partly by volunteers who feed and treat them. That same adaptability has driven the extinction or near-extinction of other species: one feral cat in New Zealand killed 102 New Zealand lesser short-tailed bats in a single week, and cats have been tied to the extinction of the flightless Lyall's wren, the South Island piopio, and the Navassa curly-tailed lizard. In Australia, one study found feral cats killing an estimated 466 million reptiles a year, spanning more than 258 identified species. As of 2007, the worldwide pet cat population had already passed 500 million, and a separate estimate put the global split at around 220 million owned cats against 480 million living as strays. Photographer Walter Chandoha built an entire career on the species, reportedly photographing 90,000 cats and leaving behind an archive of 225,000 images.

• 8. Myths And Superstitions

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  In ancient Egypt, killing a cat was forbidden outright, according to the Greek historian Herodotus, who reported that a household in mourning for a dead cat would shave its eyebrows and carry the body to the sacred city of Bubastis for embalming and burial. The goddess Bastet was often shown in cat form, sometimes taking on a lioness's fiercer aspect, and Herodotus wrote of his own astonishment at seeing domestic cats in Egypt, since he had only ever encountered wildcats before. Two coins from Magna Graecia dating to the mid-5th century BCE, showing the legendary founders Iokastos and Phalanthos playing with pet cats, offer the earliest unmistakable evidence of Greeks keeping domestic cats; the philosopher Aristotle later remarked in his History of Animals that "female cats are naturally lecherous."

  Cats gradually displaced weasels as the preferred method of pest control because they proved more pleasant company and more effective hunters of mice. During the Middle Ages, many of the associations once attached to the goddess Artemis, herself merged with Bastet by the Greeks, were transferred onto the Virgin Mary; Italian folklore holds that on the same night Mary gave birth to Jesus, a cat in Bethlehem gave birth to a kitten. In Norse mythology, the goddess Freyja rides a chariot pulled by cats, and in Japan the maneki neko figure serves as a symbol of good fortune. Some Western writers describe a favorite cat of Muhammad's named Muezza, though the story appears to trace instead to a later Sufi saint, Ahmed ar-Rifa'i, centuries afterward.

  Superstitions about cats run in both directions. A black cat crossing one's path is widely held to bring bad luck, and cats have long been associated with witches' familiar spirits. In medieval Ypres, Belgium, cats were once killed as part of a ritual now commemorated harmlessly in the modern Kattenstoet, or cat parade. The belief that cats have multiple lives appears across many cultures, with the number set at nine in English-speaking countries, seven in Italy, Germany, Greece, Brazil and parts of the Spanish-speaking world, and six in Arabic tradition; one of the earliest mentions of the myth appears in John Heywood's The Proverbs of John Heywood, printed in 1546. The myth traces back to something real: a falling cat's righting reflex genuinely does let it twist its body around and land on its feet, turning what should be a fatal drop into a survivable one.