Cow

Bos taurus

Cows are domestic cattle (Bos taurus), tamed from the wild aurochs about 10,500 years ago and now kept worldwide for milk, meat, leather and work. There are about 1.58 billion cattle and more than 1,000 breeds. Strictly, a cow is an adult female that has had a calf; the species as a whole is called cattle.

Also known as Cattle, Domestic cattle, Taurine cattle

Cow abilities

330° field of view
Sees almost all the way around without turning its head, except for a blind spot right behind its tail.
- Only the 25–50° straight ahead is seen with both eyes. That's the 3D zone for judging distance.
- This is why you should never walk up directly behind a cow: she can't see you coming.
Sources [3, 4]
≈7 h of cud-chewing a day
Swallows grass quickly, then burps soft balls of it back up to chew again, for hours every day.
- Studies find anywhere from 2.5 to 10.5 hours of rumination a day.
- Grazing alone takes about 40,000 jaw movements a day.
Sources [12, 13]
50–500 bn bacteria in one teaspoon
A giant fermenting stomach, packed with microbes, turns tough grass into cow power.
- It's one stomach with four compartments, not four stomachs.
- Microbes supply 50–70% of the cow's energy, and the cow digests the microbes too.
Sources [1, 2, 14]
35 kHz highest pitch heard
Hears high squeaks you can't: up to about 35,000 Hz, compared with your 20,000.
- Shrill noises frighten cattle, so good handling is quiet handling.
Sources [4, 6]
Tapetum mirror layer in each eye
A reflective layer behind the retina bounces light back through the eye, boosting night vision and making eyes glow in a flashlight.
68% of moos matched to the right cow (chance: 7.7%)
Every cow has her own voice. In a 2019 study, scientists matched moos to the right heifer far above chance.
- Mothers and calves recognise each other's calls.
Sources [9, 47]
≈97% AI match accuracy
No two cow noses are alike. The ridges on the muzzle are as unique as fingerprints, and AI can now read them.
≤155 L water a day (high-milk cow)
A cow making lots of milk can drink well over 100 litres of water a day. That's about a bathtub.
- Dry (non-milking) cows need far less: about 34–49 litres a day.
Sources [15]
8,510 cattle checked in satellite photosStill debated
A 2008 study of satellite photos found grazing cattle tend to line up north–south. A 2011 team found no such pattern, and a 2013 follow-up backed the first. Case still open!
Case file
2008 · for
Satellite photos of 8,510 cattle in 308 pastures: bodies tend to line up north–south.⁠[16]
2011 · against
A Czech team checked 3,412 cattle and found no alignment.⁠[17]
2013 · for
Blinded re-check of 2,235 cattle: alignment shows up, but depends on how crowded the herd is.⁠[18]
Sources [16, 17, 18]

Tap a pin on the model or a part below.

330° field of view
- Eyes on the sides of the head give a near-panorama of about 330°. Only 25–50° straight ahead is seen with both eyes, so judging depth is hard.
- Cows have two kinds of colour cones, not three like you. Reds and greens look alike to them.
- Sudden shadows and flashes of light can stop a herd in its tracks. Calm handlers wait for the leader to cross first.
- A mirror-like layer behind the retina (the tapetum) helps in dim light and makes cow eyes glow in a flashlight.
Sources [3, 4, 5, 8]
35,000 Hz highest pitch heard
- Cows hear from about 23 Hz up to 35,000 Hz. People top out near 20,000 Hz.
- High-pitched noises are especially stressful. Once upset, cattle can need 20–30 minutes to calm down.
- They are poor at pinpointing sounds: cattle need about 30° of difference to tell where a noise comes from, while people need less than 1°.
- Ears are a mood meter. Loose, hanging ears usually mean a relaxed cow.
Sources [4, 6, 7, 64]
≈97% AI nose-print match accuracy
- The ridges on every cow's muzzle form a nose print as individual as your fingerprint. Farmers have used them for ID since the 1920s.
- Cattle are keen sniffers. They can smell stress signals in other cattle's urine.
- The flehmen lip curl pushes interesting smells to a special scent organ in the roof of the mouth.
Sources [3, 10, 11]
40,000+ jaw moves a day while grazing
- No upper front teeth! The bottom front teeth press against a tough dental pad on top.
- The tongue wraps around grass and pulls to tear it, for 25,000 to more than 40,000 bites a day.
- Adults have 32 teeth: 8 at the front of the lower jaw and 24 big grinding cheek teeth.
- About 20,000 taste buds help a cow choose what to eat.
Sources [1, 3, 13, 61]
≈150 L rumen capacity
- One stomach, four rooms: rumen, reticulum, omasum and abomasum. The rumen and reticulum make up 84% of it.
- The rumen can hold up to about 150 litres, roughly 15 big buckets.
- One teaspoon of rumen fluid holds 50–500 billion bacteria, up to 60 times the number of people on Earth.
- Those microbes supply 50–70% of the cow's energy.
Sources [1, 2, 14]
48–84 beats per minute at rest
- A resting dairy cow's heart beats 48–84 times a minute.
- Normal body temperature is 38.0–39.3 °C, warmer than yours (about 37 °C).
- Cows tend to stand up when their body temperature rises and lie down when they are cooler. It has nothing to do with rain.
Sources [24, 33, 60]
≈30 kg milk a day (US average)
- Four teats, each with its own milk gland. Farmers call them quarters.
- Like every mammal, a cow makes milk after giving birth.
- The average US dairy cow gave about 24,400 lb of milk in 2025, about 30 kg a day.
- Record holder Smurf made 216,891 kg of milk in her lifetime.
Sources [20, 36, 40]
2 toes per foot
- Cattle walk on two toes per foot, the 3rd and 4th digits. That split is the cloven hoof.
- When a back foot lands, almost all the force goes onto the outer claw.
- Cows spend 8–12 hours a day lying down to rest.
Sources [40, 41, 42]
Fly swatter built in
- A tail is a cow's fly swatter. In one study, cows with docked tails had more flies on their back legs.
- Short swishes toward the body are usually about flies. A tail wagging hard while she's being brushed means she's enjoying it.
- A tail hanging still is common when a cow waits calmly, for example in the queue for milking.
Sources [62, 63]
Both sexes can grow horns
- Horns don't tell you it's a bull: in horned breeds, cows and bulls both grow them.
- Hornless (polled) is a dominant gene. Angus cattle are naturally hornless.
- Cows can tell familiar from unfamiliar cattle from photos of their faces alone.
- They can also recognise familiar human faces and match them to voices.
Sources [43, 44, 45, 46]

Real cows around the world

Photos of common breeds from Wikimedia Commons. Pick a breed to repaint the 3D model.

HolsteinBlack-and-white patches (sometimes red-and-white). The classic dairy cow.Dairy · the most common dairy breedHolstein Friesian in Dundee, Quebec. Photo: Hayden Soloviev, CC BY 4.0
JerseySmall and fawn-brown, with big dark eyes and a pale ring around the muzzle.Dairy · rich, creamy milkJersey cow on the island of Jersey. Photo: Man vyi, Public domain
AngusSolid black (or red) and naturally hornless.BeefAngus bull on a Delaware farm. Photo: Alice Welch, U.S. Department of Agriculture, Public domain
HerefordRed body with a bright white face, chest and belly.BeefHereford cow in Souris, Prince Edward Island. Photo: Hayden Soloviev, CC BY 4.0
HighlandLong shaggy coat, a fringe over the eyes and wide horns on both sexes.Beef · built for Scottish wintersHighland cow on Pupers Hill, Dartmoor. Photo: Nilfanion, CC BY-SA 3.0
BrahmanShoulder hump, a big neck flap and long droopy ears.Beef · heat-tough zebuBrahman bull at a show in Avaré, Brazil. Photo: José Reynaldo da Fonseca, CC BY 2.5
Texas LonghornEnormous horns that can span more than 2.4 m tip to tip.Beef · living historyTexas Longhorn cow near Houston. Photo: Ed Schipul, CC BY-SA 2.0
Resting is part of the job: cows lie down 8–12 hours a day. Fleckvieh cow near Oeschinen Lake, Switzerland.Photo: Kim Hansen, CC BY-SA 3.0
A calf nursing. Calves drink their mother's milk until weaning at around 8–11 months.Photo: Albarubescens, CC BY-SA 4.0

Cow by the numbers

Measured averages from studies and farm data, with comparisons you can picture.

Weight: 624 kg; average Holstein cow (study of 2,791 cows); Cow624 kg10-year-old32 kg; ≈ 20 ten-year-olds⁠[19]
Height: ≈1.5 m; at the shoulder (Holstein); Taller than most 10-year-olds⁠[19, 48]
Hearing: 35 kHz; top of the hearing range⁠[6]; Cow35,000 HzYou20,000 Hz
Food: 24 kg; of dry feed a day (milking Holstein); Plus all the water in fresh grass⁠[19]
Water: 70–155 L; a day for a milking cow; Up to about a bathtub⁠[15]
Milk: ≈30 kg; a day (US average, 2025); ≈ 115 glasses⁠[20]
Pregnancy: ≈280 days; Holstein average 279 days; Cow279 daysHuman280 days; Almost exactly as long as a human pregnancy⁠[21]
Body heat: 38–39.3 °C; normal for a dairy cow⁠[24]; Cow38.6 °CYou37 °C
On Earth: 1.58 billion; cattle in 2024; About 1 for every 5 people⁠[22]
Breeds: 1,000+; breeds worldwide; 184 breeds have already gone extinct⁠[40, 23]

Watch

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Cow myths and facts

Tap Myth or Fact for each claim, then check the answer.

0 of 8 answered

“Cows have four stomachs.”
“Bulls charge because they hate the colour red.”
“No two cows have the same nose print.”
“Cows lie down when rain is coming.”
“Every cow has her own voice.”
“Cows sleep standing up.”
“Only bulls have horns.”
“A cow can see almost all the way around itself.”

Cow world records

Record holders confirmed by Guinness World Records.

Oldest cow ever
48 yrs 9 mo
Big Bertha
County Kerry, Ireland · died 1993⁠[29]
Tallest cow ever
1.90 m
Blosom (Holstein)
Illinois, USA · 2014⁠[32]
Tallest steer ever
2.05 m
Fiorino (Chianina)
Italy · 2007⁠[34]
Widest horns
3.24 m
Poncho Via (Texas Longhorn)
tip to tip · Alabama, USA · 2019⁠[35]
Most milk in a lifetime
216,891 kg
Smurf (Holstein)
Ontario, Canada⁠[36]
Shortest cow ever
69.07 cm
Blaze (miniature zebu)
2013⁠[37]
Most tricks in a minute
10 tricks
Ghost
2023⁠[38]
Longest hair (breed)
≈35 cm
Highland cattle
average hair length⁠[39]

History of cattle

From the wild aurochs to 1.58 billion cattle today.

Ice Age – 1600s
The mighty aurochs
Cattle's wild ancestor: bulls stood up to 1.8 m at the shoulder, with horns up to 80 cm long.⁠[26]
≈10,500 years ago
Tamed in the Near East
Early farmers domesticated aurochs. DNA suggests modern taurine cattle trace back to as few as about 80 wild females.⁠[25]
8,000–10,000 years ago
The humped zebu
Zebu cattle were domesticated separately, most likely in the Indus Valley.⁠[27]
≈4,200 years ago
Drought spreads zebu genes
During a centuries-long drought, zebu bulls' heat-tough genes spread across the Near East.⁠[28]
1493
Across the Atlantic
Columbus's second voyage brought the first cattle to the Americas, landing on Hispaniola.⁠[30]
1627
The last aurochs
The last known aurochs, a cow, died in Jaktorów Forest, Poland.⁠[26]
2009
Genome decoded
Scientists published the cow genome: at least 22,000 genes.⁠[31]
2024
1.58 billion cattle
About one for every five people on Earth.⁠[22]

Calf, heifer, bull or steer?

Horns won't tell you who's who: both sexes can have them. Look for these clues instead.

Calf
A youngster, until it's weaned at around 8–11 months.
Heifer
A young female that hasn't had a calf yet.
Cow
A female that has had a calf. Look for the udder.
Bull
An adult male used for breeding. Usually big, with a thick neck.
Steer
A castrated male, usually raised for beef.
Ox
Cattle trained to pull carts or ploughs, usually steers.

Cows and climate

Numbers vary with farm, diet and method. Researchers are working on better feeds, breeding and manure handling.

≈100 kg
of methane a year per cow
Most of it is burped out. It's made by archaea, one kind of microbe living in the rumen.⁠[57, 14]
≈12%
of human-made greenhouse gas comes from livestock
Cattle are about 62% of that, according to the UN's FAO (2015 data).⁠[58]
45–68%
less methane in a seaweed trial
In a 2021 study, a pinch of red seaweed (Asparagopsis) in the feed cut steers' methane. Scientists are still checking long-term safety and how to feed it to cows on pasture.⁠[59]

Cow quiz

12 questions. Every answer is somewhere on this page.

Question 1 of 12Score 0

How many stomachs does a cow have?

Cow field notes

Diet, food web, safety and badges from the Snappit field guide.

Diet & Feeding

Cows are herbivores that love to eat grass, hay, and other plants.

Primary Foods

Grass
Hay
Silage
Alfalfa
Foraging Method: Grazing

Age differences: Calves drink milk from their mother before transitioning to solid foods.

Ecological connections

WolfEaten by
Wolves occasionally hunt calves or weak adult cattle.
Kentucky bluegrassEats
Cows graze on this common pasture grass for nutrients.
White cloverEats
Cows eat this protein-rich plant found in pastures.
Horn flyParasite
Horn flies feed on cow's blood, causing irritation and stress.

Safety

Danger 3/5 · Moderate

Stay calm and quiet around cows. Never walk up directly behind a cow, and never get between a cow and her calf. If you see the white of her eye, give her space.

Traits

Collections

Mammals

Classification

Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Order: Artiodactyla
Family: Bovidae
Genus: Bos

Also known as

Cattle · Domestic cattle · Taurine cattle · Bovine · Dairy cow · Beef cattle · Kine (old plural)

Sources for these cow facts

64 studies and references · checked Oct 15, 2026

Frequently Asked Questions

How to identify Cow?

Compare ears, muzzle, tail, feet and coat markings. Size is hard to judge without something nearby for scale, and young mammals may not have adult coloring yet. Mammal Identifier: upload a photo and compare the visible details.

How long is Cow?

200-260 cm

How much does Cow weigh?

400-1000 kg

How long does Cow live?

15-20 years

What does Cow eat?

Cows are herbivores that love to eat grass, hay, and other plants.

Where is Cow usually found?

Farms and grassy fields.

How many babies does Cow usually have?

Do cows have four stomachs?

No. A cow has one stomach with four compartments: the rumen, reticulum, omasum and abomasum. The rumen and reticulum make up about 84% of it, and the rumen alone can hold up to about 150 litres.

How far around can a cow see?

About 330°, because its eyes sit on the sides of its head. Only 25–50° straight ahead is seen with both eyes, and there is a blind spot directly behind the cow.

Why do cows chew all day?

Cows are ruminants. They swallow grass quickly, then bring it back up as cud and chew it again. Dairy cows spend about 7 hours a day chewing cud, and grazing alone takes about 40,000 jaw movements a day.

Do bulls really hate the colour red?

No. Cattle are red–green colour-blind. A bull reacts to the movement of the cape, not its colour.

How much water does a cow drink a day?

A milking cow drinks about 70–155 litres of water a day, depending on how much milk she makes. A dry cow drinks about 34–49 litres.

Can cows recognise each other's voices?

Yes. Each cow has her own voice: in a 2019 study scientists matched calls to the right heifer far more often than chance, and mothers and calves recognise each other's calls.

When were cows domesticated?

About 10,500 years ago in the Near East, from the wild aurochs. Humped zebu cattle were domesticated separately in South Asia.