Chicken

Chickens are large birds.

They come from wild birds in Asia.

Most chickens live on farms. They give us meat and eggs. Some people keep them as pets.

Chickens like to live in groups. They live in a flock. They follow a leader.

They use their feet to scratch the dirt. They look for seeds and bugs. They can even find small mice.

Female chickens lay eggs. The eggs hatch in 21 days. A tiny chick breaks out. They are very busy birds.

Chickens are common birds found all over the world. They come from a wild bird called the red junglefowl.

People first began living with them in Southeast Asia. This happened about 8,000 years ago.

Chickens are social animals. They live in a group called a flock. Within a flock, some birds are more dominant than others. This creates a pecking order. This means certain birds get food or nests first.

Most chickens are kept for food. Some are raised for meat, and others for eggs. A hen is an adult female. A hen bred for eggs can lay over 300 eggs a year.

Chickens are omnivores. This means they eat both plants and animals. They scratch the soil for seeds and insects. They may even eat small mice or lizards.

When a hen sits on her eggs to keep them warm, she is called broody. After 21 days, the eggs hatch. A tiny chick uses an egg tooth to break the shell. The hen then guards her chicks to keep them safe.

Chickens are one of the most common animals on our planet. They are domesticated birds that people keep for many reasons. Most people raise them to provide meat or eggs for food. Some people even keep them as pets in their homes.

As of 2023, there are more than 26.5 billion chickens in the world. Every year, people produce over 50 billion birds for food.

These birds have a very interesting way of living together. They are social animals that live in groups called flocks. Inside a flock, birds follow a pecking order. This means some birds are more dominant than others. The dominant birds get first choice of food and nesting spots.

They also use different sounds to talk to each other. A rooster makes a loud crowing sound to mark his territory. Hens cluck loudly to call their chicks or after laying an egg.

Scientists believe chickens came from a wild bird called the red junglefowl. This wild bird is native to Southeast Asia. People likely began domesticating them about 8,000 years ago.

Some researchers think chickens were attracted to rice growing in Thailand. They might have nested near the rice and became tame. This happened around the same time people were growing rice.

Over time, these birds spread to China, India, and many other places.

Chickens have many different names depending on their age and sex. An adult female is called a hen. An adult male is often called a rooster or a cock. A young female is called a pullet. A young male is called a cockerel.

Baby chickens are called chicks. There are also special breeds like broilers for meat. Some hens are amazing layers that can make 300 eggs in one year.

Watching a chicken grow is a busy process. A hen will sit on her eggs to keep them warm. This is called going broody. After about 21 days, the eggs will hatch. The tiny chick uses a special egg tooth to break the shell.

The hen stays with them to keep them warm and safe. She leads the chicks to find food and water. The chicks follow her closely because they imprint on her. This helps the young birds learn how to survive.

The chicken, known scientifically as Gallus gallus domesticus, is a highly successful domesticated bird. It is a widespread species found in almost every part of the world. Most people keep chickens for their meat or their eggs. Some people also keep them as pets. As of 2023, the global chicken population is over 26.5 billion birds.

Every year, more than 50 billion birds are produced for human consumption. This makes chickens a central part of global animal husbandry, which is the science of raising livestock.

Chickens are descended from the red junglefowl, or Gallus gallus. These wild birds are native to Southeast Asia.

Scientists believe the two are the same species. Domestic chickens have also interbred with other types, such as the grey, green, and Sri Lankan junglefowl. For example, a gene for yellow skin came from the grey junglefowl. Modern chickens share between 71% and 79% of their genome with the red junglefowl. This means their genetic makeup is very similar to their wild ancestors.

Humans began domesticating chickens roughly 8,000 years ago in Southeast Asia.

One theory suggests this happened alongside the growth of rice. In central Thailand, at a site called Ban Non Wat, researchers found chicken bones from 3,250 years ago. They believe wild junglefowl were attracted to the rice seeds. The birds nested near the crops and eventually became tame. From Southeast Asia, chickens spread to China and India. They later reached Africa and the Americas through various trade routes and migrations.

Chickens have many different names based on their age and sex. An adult female is a hen. A young female under one year old is a pullet. In the poultry industry, a pullet is considered sexually immature if it is under 22 weeks of age. An adult male is a cock or a rooster. A young male is a cockerel.

Newly hatched birds are called chicks or biddies. There are also specialized breeds. Broilers are chickens bred specifically for meat. Laying hens are bred to produce eggs. A single laying hen can produce over 300 eggs in one year.

Physically, chickens are large, active birds that are most busy during the day. They have round bodies and short wings. Because their flight muscles are quite heavy, they can only fly short distances. Most breeds have unfeathered legs. Both males and females have a fleshy crest on their heads called a comb. They also have skin flaps under their beaks called wattles. These features are usually more prominent on males. Some breeds even have extra feathers under their faces that look like a beard.

Chickens are social animals that live in groups called flocks. They follow a social structure known as a pecking order. This was described by Thorleif Schjelderup-Ebbe in 1921. In this system, certain individuals are dominant. These dominant birds get first access to food and the best nesting sites. Chickens also use complex vocalizations to communicate. Roosters use a loud crow to signal their territory. Hens cluck to call their chicks or to signal after laying an egg. They even have different warning calls for predators on the ground versus those in the air.

Reproduction in chickens is controlled by a neuroendocrine system. This involves hormones like estrogen and progesterone.

To mate, a rooster may perform a circle dance near a hen. If the hen is receptive, the male mounts her. Sperm transfer happens through a process called the "cloacal kiss." After mating, the hen may go "broody." This means she sits on a nest to incubate her eggs. The incubation period lasts about 21 days. When the chicks hatch, they use a tiny egg tooth to break the shell. The hen then protects and warms them as they learn to feed.

Chickens are omnivores, meaning they eat both plants and animals. In the wild, they scratch the soil for seeds and insects. They may even eat small animals like lizards, snakes, or mice. While they are often seen as food sources, they are very intelligent. Their emotions and social behaviors are similar to other birds and mammals. They can even work together to mob and kill a predator, such as a young fox.