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Mammal vs. Reptile: What's the Difference?

Edited by Huma Saeed || By Sumera Saeed || Updated on October 27, 2023
Mammals are warm-blooded vertebrates with hair or fur, while reptiles are cold-blooded vertebrates with scales.

Key Differences

Mammals are warm-blooded creatures, meaning they maintain a constant internal body temperature, while reptiles are ectothermic, or cold-blooded, relying on their environment to regulate their body temperature.
Sumera Saeed
Oct 27, 2023
Both mammals and reptiles belong to the vertebrate group, but mammals give birth to live young (with few exceptions), whereas most reptiles lay eggs.
Sumera Saeed
Oct 27, 2023
Another distinguishing feature is the presence of mammary glands in mammals, which produce milk to nourish their young. Reptiles, on the other hand, do not have mammary glands and do not produce milk.
Sumera Saeed
Oct 27, 2023
Mammals have hair or fur covering their bodies, providing insulation. Reptiles possess scales, which offer protection but do not provide thermal insulation as fur does.
Janet White
Oct 27, 2023
The heart structure also differs: mammals typically have a four-chambered heart, ensuring a separation between oxygenated and deoxygenated blood. In contrast, most reptiles have a three-chambered heart, with some exceptions like crocodilians that have a four-chambered heart.
Aimie Carlson
Oct 27, 2023
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Comparison Chart

Blood Type

Warm-blooded (endothermic)
Cold-blooded (ectothermic)
Sumera Saeed
Oct 27, 2023

Reproduction

Gives birth to live young (mostly)
Lays eggs (mostly)
Sumera Saeed
Oct 27, 2023

Body Covering

Hair or fur
Scales
Sumera Saeed
Oct 27, 2023

Heart

Four-chambered heart
Three-chambered heart (some exceptions)
Sumera Saeed
Oct 27, 2023

Feeding Young

Possess mammary glands and produce milk
Do not produce milk
Sara Rehman
Oct 27, 2023
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Mammal and Reptile Definitions

Mammal

Most mammals give birth to live young.
The dolphin, a mammal, gives birth to live calves.
Huma Saeed
Oct 27, 2023

Reptile

Reptiles do not have mammary glands and don't produce milk.
The crocodile, a reptile, leaves her eggs unattended.
Sara Rehman
Oct 27, 2023

Mammal

Mammals possess mammary glands to feed their offspring.
The cow, a mammal, provides milk for her calf.
Janet White
Oct 27, 2023

Reptile

Many reptiles have a three-chambered heart.
The chameleon, a reptile, has a unique heart structure.
Harlon Moss
Oct 27, 2023

Mammal

Mammals are warm-blooded vertebrates.
The lion, a mammal, prowls the savanna.
Janet White
Oct 27, 2023

Reptile

Reptiles have scales covering their bodies.
The snake, a reptile, sheds its scales periodically.
Sumera Saeed
Oct 27, 2023

Mammal

Mammals typically have a four-chambered heart.
The human, also a mammal, has a complex cardiovascular system.
Sumera Saeed
Oct 27, 2023

Reptile

Most reptiles lay eggs.
The turtle, being a reptile, buries its eggs in the sand.
Sumera Saeed
Oct 27, 2023

Mammal

Mammals have hair or fur on their bodies.
The bear, being a mammal, has a thick fur coat.
Janet White
Oct 27, 2023

Reptile

Reptiles are cold-blooded vertebrates.
The lizard, a reptile, basks in the sun to warm itself.
Huma Saeed
Oct 27, 2023

Mammal

Any of various warm-blooded vertebrate animals of the class Mammalia, including humans, characterized by a covering of hair on the skin and, in the female, milk-producing mammary glands for nourishing the young.
Sumera Saeed
Aug 01, 2017

Reptile

Any of various usually cold-blooded egg-laying vertebrates often grouped in the class Reptilia, having dry skin covered with scales or horny plates and breathing by means of lungs, and including the snakes, lizards, crocodilians, and turtles. In some classification systems, birds are considered to be reptiles because they are descended from reptilian dinosaurs.
Sumera Saeed
Aug 01, 2017

Mammal

An animal of the class Mammalia, characterized by being warm-blooded, having hair and producing milk with which to feed its young.
Sumera Saeed
Aug 01, 2017

Mammal

(paleontology) A vertebrate with three bones in the inner ear and one in the jaw.
Sumera Saeed
Aug 01, 2017

Mammal

One of the Mammalia.
Sumera Saeed
Aug 01, 2017

Mammal

Any warm-blooded vertebrate having the skin more or less covered with hair; young are born alive except for the small subclass of monotremes and nourished with milk
Sumera Saeed
Aug 01, 2017

FAQs

What is a reptile?

A reptile is a cold-blooded vertebrate with scales.
Huma Saeed
Oct 27, 2023

Do reptiles give birth to live young?

While most reptiles lay eggs, some, like certain snakes, give birth to live young.
Sara Rehman
Oct 27, 2023

What is a mammal?

A mammal is a warm-blooded vertebrate with hair or fur and mammary glands.
Sumera Saeed
Oct 27, 2023

Do mammals lay eggs?

Most mammals give birth to live young, but a few, like the platypus, lay eggs.
Sumera Saeed
Oct 27, 2023

Which mammal is known for laying eggs?

The platypus and echidna are unique mammals known for laying eggs.
Janet White
Oct 27, 2023

Which is the largest mammal?

The blue whale is the largest mammal.
Sumera Saeed
Oct 27, 2023

Why do mammals have fur or hair?

Mammals have fur or hair for insulation, protection, and sensory purposes.
Sumera Saeed
Oct 27, 2023

What's the heart structure of reptiles?

Most reptiles have a three-chambered heart, but some, like crocodilians, have a four-chambered heart.
Aimie Carlson
Oct 27, 2023

Do mammals have scales?

No, mammals have hair or fur, not scales.
Aimie Carlson
Oct 27, 2023

Can reptiles be found in the sea?

Yes, some reptiles like sea turtles and marine iguanas live in the sea.
Janet White
Oct 27, 2023

Are whales mammals or reptiles?

Whales are mammals.
Sumera Saeed
Oct 27, 2023

Do reptiles feed their young with milk?

No, reptiles do not have mammary glands and don't produce milk.
Sumera Saeed
Oct 27, 2023

What purpose do scales serve in reptiles?

Scales in reptiles provide protection and help in moisture retention.
Sara Rehman
Oct 27, 2023

Are snakes reptiles or mammals?

Snakes are reptiles.
Harlon Moss
Oct 27, 2023

Which is the largest reptile?

The saltwater crocodile is the largest reptile.
Sumera Saeed
Oct 27, 2023

Do all reptiles have legs?

No, some reptiles like snakes and certain lizards do not have legs.
Sumera Saeed
Oct 27, 2023

What do mammal offspring feed on?

Mammal offspring typically feed on milk produced by their mother's mammary glands.
Harlon Moss
Oct 27, 2023

Are all reptiles cold-blooded?

Yes, reptiles are cold-blooded or ectothermic, relying on their environment to regulate body temperature.
Sumera Saeed
Oct 27, 2023

Do all mammals have a four-chambered heart?

Most mammals have a four-chambered heart which efficiently separates oxygenated and deoxygenated blood.
Sumera Saeed
Oct 27, 2023

Are all mammals warm-blooded?

Yes, all mammals are warm-blooded or endothermic, meaning they maintain a constant body temperature.
Sumera Saeed
Oct 27, 2023
About Author
Written by
Sumera Saeed
Sumera is an experienced content writer and editor with a niche in comparative analysis. At Diffeence Wiki, she crafts clear and unbiased comparisons to guide readers in making informed decisions. With a dedication to thorough research and quality, Sumera's work stands out in the digital realm. Off the clock, she enjoys reading and exploring diverse cultures.
Edited by
Huma Saeed
Huma is a renowned researcher acclaimed for her innovative work in Difference Wiki. Her dedication has led to key breakthroughs, establishing her prominence in academia. Her contributions continually inspire and guide her field.

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