The word “chicken” comes from the Old English cicen, meaning “young fowl.”

Chickens are living descendants of dinosaurs, specifically theropods like the T. rex, but they are not uniquely its closest relative, as all modern birds share this lineage.

Thanks to their eyes being on the sides of their head, chickens have a field of vision of nearly 300 degrees.

Studies show chickens can recognize and remember over 100 individual faces, both of other chickens and humans.

A broody hen will turn her eggs about 50 times a day to prevent the embryo from sticking to the shell membrane.

Chickens experience REM sleep, the phase associated with dreaming in mammals.

Roosters crow to establish territory and will also crow in response to loud noises like car horns or other roosters.

A chicken’s heart beats very quickly, with a resting rate of about 275 times per minute.

The fear of chickens is called alektorophobia.

The term “pecking order” was coined to describe the strict social hierarchy within a chicken flock.

Hens communicate with their chicks while they are still inside the egg through soft clucking sounds.

Chickens are intelligent; they can remember locations, solve simple puzzles, and learn from observation.

A hen from a modern commercial laying breed can produce about 250 to 300 eggs per year.

As a general rule, a hen’s earlobe color indicates her egg color: white earlobes usually mean white eggs, and red earlobes usually mean brown eggs, with a few notable exceptions.

Chickens have three eyelids: an upper lid, a lower lid, and a translucent nictitating membrane that sweeps across the eye for protection and moisture.

A rooster’s comb acts as a temperature regulator, helping to dissipate body heat.

Lighter, more agile chicken breeds are capable of flying short distances, up to 10 or 15 feet.

Chickens practice dust bathing to clean their feathers and suffocate skin parasites.

When needed, chickens can run at speeds of up to 9 miles per hour.

Hens have a natural instinct to lay their eggs in hidden, sheltered spots for safety, which is why farmers provide nesting boxes.

A fertilized egg is perfectly safe to eat as long as it has not been incubated and developed.

It is common for a hen to sing a loud, cackling “egg song” after laying an egg.

Roosters have a natural defense for their own ears; when they crow, soft tissue covers part of their ear canal to protect their hearing from the sound, which can exceed 100 decibels.

Breeds like the Araucana and Ameraucana carry a gene that naturally causes them to lay blue or blue-green eggs.

Archaeological evidence indicates that chickens were first domesticated from the Red Junglefowl in Southeast Asia over 8,000 years ago.

In ancient Rome, priests practiced augury, which involved divining the future from the eating behavior of sacred chickens.

With a global population of over 25 billion, chickens are the most numerous bird species on Earth.

A chicken’s beak is made of keratin, the same protein that makes up human fingernails and hair.

Chickens have superior color vision to humans; they possess four types of cone cells, known as tetrachromacy, that allow them to see a broader spectrum of colors, including ultraviolet light.

A chick uses a temporary, sharp projection on its beak called an “egg tooth” to pip and break out of its shell during hatching.

Roosters often demonstrate protective behavior, putting themselves between a threat and the hens, and will sound alarm calls or fight off predators.

The Silkie chicken breed is known for its fibromelanosis, a genetic trait that gives it black skin, bones, and connective tissue.

Research indicates that chickens can show signs of empathy; hens displayed stress responses when their chicks were exposed to a puff of air.

Since they lack teeth, chickens ingest small stones called grit that collect in their muscular gizzard to help grind down hard food.

The heaviest chicken on record was a rooster named Little John from the United Kingdom, who weighed 22 pounds.

For safety from predators, chickens have a strong instinct to sleep perched up high on roosts.

Chickens form complex social bonds, and hens will often develop strong friendships, spending most of their time with specific flock members.

For a fertilized egg to develop into a chick, it must be kept at a constant temperature of approximately 99 to 102°F (37 to 39°C).

There are more than 500 distinct chicken breeds globally, ranging in size from tiny bantams to large breeds like the Jersey Giant.