Are Chickens Mammals or Birds? Let’s Find Out Here

Are Chickens Mammals or Birds? Let’s Find Out Here.

… chicken is a type of domesticated fowl, a subspecies of the red jungle fowl. It is one of the most widespread domestic animals in the world.

There are more chickens in the world than any other bird. Humans keep chickens primarily as a food source (consuming meat and eggs) and, more rarely, as pets.

Originally, the chicken was raised for cockfighting or special ceremonies. Chickens were not kept for food until the Hellenistic period (fourth–second centuries BCE).

Have you ever wondered if Chicken is Mammals or Birds? You don’t have to think much about it anymore, as this article will help you know whether chickens are Mammals or Birds.

picture of chickens

Are Chicken Mammals or Birds?

To answer whether chickens are mammals or birds, we must understand the basic difference between the two animal groups.

Mammals are warm-blooded vertebrate animals. They have fur or hair and glands to secrete milk by which they feed their young ones.

They are also warm-blooded, and most of them have teeth. The only exception to the last is anteaters, which do not have teeth.

Birds are also warm-blooded vertebrate animals with feathers, wings, and beaks. However, unlike mammals, birds lay eggs instead of giving birth to young ones.

Having established that fact, it is obvious that chickens are birds, not mammals. Like all other birds, chickens lay eggs and are covered with feathers.

Not just that, mammals have mammary glands, and chickens do not. The only mammals that do not possess any hair are dolphins and whales.

Clear Differences Between Chicken, Hen, and Rooster


Chicken: 
The general term for the species as a whole. This includes both male and female adults.
Chick: Just like “Chicken,” this is a term for the species as a whole, both male and female. But this term is for young males and females that have not reached adulthood yet.

Hen: This term is for an adult female chicken.
Pullet: This is a young female chicken that has not reached adulthood yet. Pullets haven’t reached the age where they start laying eggs.

Rooster: An adult male chicken. These are the ones that crow, generally starting early in the morning.
Cockerel: A young male chicken that has not reached adulthood yet.

Let’s also consider some unique features of chicken.

1. Bones

The bones of a chicken are uniquely hollow and help them to maximize strength for weight. Their air sacs sit within their lightweight frame. These air sacs are filled and deflated by the input from their respiratory system.

2.  Feathers

Another unique feature of chickens is that they do not have hairs or scales. Rather, they have feathers, and you would agree that feathers are a unique identifier of the fowl species.

3. Lays Eggs

The fertilized egg is not carried internally for chickens as is for mammals. Gestation for the soon-to-be chick happens outside of the body. And the development of the chick, as in the case of mammals, happens in a nest and not in a womb.

4.  Beaks

A bird’s beak is assumed as a defining feature of the fowl family. But incredibly, mammals and reptiles share this attribute, although not in shape but in composition.

5. Warm-Blooded

A chicken is a warm-blooded animal. This implies that their body temperature is internally maintained. The normal body temperature of a chicken is between 105 and 107 degrees Fahrenheit, which is the temperature of someone with a fever.

Is chicken an example of a mammal?

A chicken is not a mammal. As chickens don’t produce milk and don’t birth live young, they aren’t mammals. This is because mammals generate milk for a baby that is born, not hatched.

Which does chicken belong to?

Chickens (Gallus gallus) are members of the family Phasiandae and are among the most domesticated animals. Even though they are commonly believed to have morphed from the wild red jungle fowl of India, the scientific term for the chicken is disputed.

Do fish count as mammals?

Fish aren’t mammals since many of them are not warm-blooded, although a few sharks and species of tuna are exceptional cases. They lack fingers, toes, limbs, fur, and hair.

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