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Birds · 2 species guides

Farmed & Domestic Birds

Farmed birds are species kept for meat, eggs or feathers — overwhelmingly chickens, plus turkeys, ducks and geese; chickens are the most numerous bird on Earth by an enormous margin, with more than 25 billion alive at any time, and their welfare is the largest animal welfare issue by sheer number of individuals.

Broiler versus layer
Two entirely different breeding programmes. Broilers are bred for rapid muscle growth and reach slaughter weight in about six weeks; layers are bred for egg output and are much lighter-framed.
Wild ancestor
The red junglefowl is smaller, flightier and far more slender than any domestic chicken, with a long sickle-shaped tail and a much more restricted laying pattern.
Domestic duck ancestry
Almost all domestic ducks descend from the mallard, except the Muscovy, which is a separate South American species.
Turkey
Domesticated in Mesoamerica from the wild turkey of North America. Commercial breeds are so heavily muscled in the breast that natural mating is generally not possible.

The most numerous bird on Earth is not a wild species. It is the domestic chicken, with over 25 billion alive at any moment — more individuals than the next several thousand bird species combined. That single fact reframes what "bird welfare" means: whatever else is happening to birds globally, the overwhelming majority of individual birds alive right now are farmed.

The domestic chicken descends primarily from the red junglefowl of Southeast Asia, with some genetic contribution from grey junglefowl. Selective breeding has changed it profoundly. A modern broiler chicken reaches slaughter weight in around six weeks, roughly four times faster than a bird from the 1950s, and that growth rate is itself the source of most of the welfare problems associated with the industry.

Key facts

  • Chickens are the most numerous bird on Earth, with over 25 billion alive at any time — more than all wild bird species combined many times over.
  • The domestic chicken descends chiefly from the red junglefowl of Southeast Asia, with some grey junglefowl ancestry.
  • Modern broiler chickens reach slaughter weight in around six weeks, roughly four times faster than 1950s birds; that growth rate causes most of the associated welfare problems.
  • Broilers and layers are separate breeding lines with entirely different bodies, which is why male chicks of layer strains have no commercial use.
  • Chickens have demonstrated self-control in delayed-gratification tests, recognise individual flock members, and use over 20 distinct vocalisations.
  • Labelling terms describe housing rather than breed. Slower-growing strains improve welfare outcomes more reliably than housing changes alone.

How to recognise them

The features that separate this group in the field, in the order they are usually most useful.

Broiler versus layer
Two entirely different breeding programmes. Broilers are bred for rapid muscle growth and reach slaughter weight in about six weeks; layers are bred for egg output and are much lighter-framed.
Wild ancestor
The red junglefowl is smaller, flightier and far more slender than any domestic chicken, with a long sickle-shaped tail and a much more restricted laying pattern.
Domestic duck ancestry
Almost all domestic ducks descend from the mallard, except the Muscovy, which is a separate South American species.
Turkey
Domesticated in Mesoamerica from the wild turkey of North America. Commercial breeds are so heavily muscled in the breast that natural mating is generally not possible.
Labelling
Free-range, barn, organic and cage-free describe housing, not breed or growth rate. A free-range broiler is usually still a fast-growing strain, and growth rate drives most welfare outcomes.

2 farmed & domestic birds guides

Search or filter by conservation status. Every guide carries sourced facts, IUCN status and FAQs.

Showing 1-2 of 2 animals

Animal group
A black and red domestic rooster (Gallus gallus domesticus) stands alert on open green grass in a farmyard, with historic farm buildings and forested hills visible in the background.
Domesticated

Birds

C

Chicken

Gallus gallus domesticus — descended from red junglefowl (Gallus gallus)

The world's commonest bird — junglefowl turned livestock, companion and welfare challenge at industrial scale.

Worldwide — domestic; wild ancestor in South and South-east Asia

Open guide
A male wild turkey (tom) in full display, fanning its broad iridescent bronze tail feathers, with a bare bluish-red head, dangling red wattle and snood, in open North American woodland.
Least Concern

Birds

W

Wild Turkey

Meleagris gallopavo

North America's big, iridescent ground bird and the wild ancestor of the farmyard turkey.

North America (United States, Mexico, southern Canada)

Open guide

Conservation: what this group faces

Farmed birds are not a conservation issue — they are the largest animal welfare issue on Earth by number of individuals. Over 25 billion chickens are alive at any moment and around 70 billion are slaughtered each year, which means most birds alive right now are farmed. The dominant driver of poor welfare is growth rate rather than housing: a bird bred to reach slaughter weight in six weeks carries skeletal and cardiac problems no housing system corrects. Slower-growing strains are the single change with the largest documented effect.

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Farmed & domestic birds: frequently asked questions

How many chickens are there in the world?
More than 25 billion alive at any given time, making the domestic chicken by far the most numerous bird on Earth — outnumbering all wild bird species combined by a large margin. Around 70 billion are slaughtered annually.
What did chickens evolve from?
Primarily the red junglefowl (Gallus gallus) of Southeast Asia, domesticated several thousand years ago, with genetic contribution from the grey junglefowl. Red junglefowl are smaller, more slender and far more flighty than any domestic breed.
How fast do farmed chickens grow?
Modern broilers reach slaughter weight in around six weeks — roughly four times faster than birds of the 1950s at the same weight. This growth rate is achieved through selective breeding and is the root of most welfare problems, including leg disorders and cardiac failure.
What is the difference between a broiler and a layer?
They are separate breeding lines. Broilers are bred for rapid muscle growth and slaughtered at about six weeks. Layers are bred for egg production and are much lighter-framed. Because layer males cannot be economically reared for meat, they are culled shortly after hatching.
Are chickens intelligent?
More than their reputation suggests. Studies have shown chickens can exercise self-control in delayed-gratification tasks, recognise and remember individual flock members, demonstrate basic numerical understanding, and use more than 20 distinct vocalisations with specific meanings.
Does free-range mean better welfare?
It describes housing, not breed or growth rate. A free-range broiler is usually still a fast-growing strain with the same underlying leg and heart problems. Slower-growing breeds, lower stocking density and genuine environmental enrichment change welfare outcomes more reliably than the housing label alone.

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