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Mammals. Mandy Wood. Animal Classes. There are six major classes of animals: fish, amphibians, reptiles, birds, insects, and mammals . We will learn about mammals and how they are different from the other types of animals. Amphibians. Fish. Reptiles. Mammals. Birds. Insects.

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Mandy Wood

animal classes

There are six major classes of animals: fish, amphibians, reptiles, birds, insects, and mammals.

We will learn about mammals and how they are different from the other types of animals.







facts about mammals
Facts about Mammals
  • There are about 4,000 types of mammals. But, this is a small class since there are over 20,000 types of fish and over 800,000 types of insects!
  • Humans are mammals!
traits common to all mammals
Traits Common to All Mammals
  • They are warm-blooded.
  • They have fur or hair.
  • Mammal babies drink milk from their mothers.
  • Mammals are vertebrates; this means they have backbones or spines.
warm blooded what does it mean
Warm-Blooded:What does it mean?

Warm-blooded means that mammals maintain a relatively constant and warm body temperature. A mammal’s body temperature isn’t affected by outside temperatures.

On the other hand, animals like reptiles are cold-blooded. The body temperature of cold-blooded animals changes with the environment.

  • All mammals have hair on their bodies. Bears, horses, and bats are clearly covered with fur. Even marine mammals (those that live in water), have hair, but you would need a microscope to see it.
mammals drink milk
Mammals Drink Milk
  • Baby mammals are born in different ways, but they all drink milk from their mothers.
  • Mammal mothers have special milk-producing glands called “mammary glands.” Only mammals have these!
  • Unlike fish or other animals, the babies depend on their mothers after they are born.
mammals are vertebrates
Mammals are Vertebrates

What are vertebrates?

Vertebrates are animals with a spinal cord encased in a vertebrae or a backbone.

other characteristics common only to mammals
Other Characteristics Common Only to Mammals
  • Jaw bones: Mammals have a single bone on either side, but other animals have more than one bone.
  • Ears: Mammals have three bones in their middle ear.
  • Hearts: The artery leaving our heart curves differently than any other animal’s heart.
  • Diaphragms: Mammals have a special sheet of muscles and tendons called a diaphragm. It separates the inside of the body into two parts.
classifying mammals
Classifying Mammals
  • Mammals are classified by the way they are born. There are three main types.



Placental Mammals


A duck-billed platypus


  • They lay eggs! That’s right – mammals can lay eggs!
  • Common types of monotremes are the duck-billed platypus and echidnas.


  • Marsupials are mammals whose young are born very underdeveloped. Mother marsupials often have pouches. Their babies crawl into the pouches and drink their mothers’ milk.
  • Kangaroos, opossums, Tasmanian devils, and koalas are common types.

Placental Mammals

  • Placental mammals are mammals whose young are born at a more advanced stage. Before birth, the young are fed through a placenta. The placenta is a special organ that delivers oxygen and nutrients to the young, growing baby.
  • Common types: humans, rodents, elephants, and whales
  • Mammals

1) Are warm-blooded

2) Have hair

3) Drink milk from their mothers

4) Have backbones

  • There are three types – marsupials, monotremes, and placental mammals.
  • Humans, dolphins, dogs, bats, and koalas are all mammals!
  • Now, let’s see how much we know about mammals! Click the link below, and it will direct you to a document that will test your new knowledge!

Is it a Mammal?

  • For more mammal fun, visit these interesting facts pages!

Mammal Facts Page

Mammal Safari