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Animal Classification
Scientists cannot seem to agree on whether there should be 5 or 6 kingdoms of living things. The argue over whether bacteria should be divided into one or two kingdoms.
Note: Students do NOT need to know this information for the test.
Examples in each of the six kingdoms.
Note: Students do NOT need to know this information for the test.
Note: Students do NOT need to know this for the test!!
How do we classify animals?When you classify, you arrange things into groups based on ways that they are
alike. Scientists grouped animals into classes to make it easier to study them.
All animals are divided into two main groups – vertebrates and invertebrates.
Vertebrates Invertebrates
VertebratesA vertebrate is an animal that has a spine or backbone. The
five most well known classes of vertebrates are birds, fish,
mammals, reptiles, and amphibians.
MammalsMammals are warm-blooded animals that feed their young with milk,
have fur or hair, and breathe air with lungs. Being warm-blooded means
the body temperature stays the same when it is cold or hot outside.
Examples of mammals include humans,
elephants, horses, whales, dogs, and giraffes.
Can you think
of more
mammals?
AmphibiansAmphibians are born in the water and breathe with gills like a fish.
When they grow up, they develop lungs and can live on land.
Most amphibians hatch from eggs.
After they hatch, they can only live under water like a fish
with gills to breathe and fins to swim with.
As they grow older, they undergo changes called metamorphosis.
They grow lungs to breath air and limbs for walking on the ground. 3
2
1
Amphibians are cold-blooded meaning their bodies don’t
automatically regulate their temperature. Their body temperature
depends on whether it is cold or hot outside.
There are more than 4000 different kinds of amphibians. Examples
include frogs, salamanders, newts, and frogs.
Frog
ReptilesReptiles are cold-blooded animals born on land. They have scaly
skin and they breathe using lungs. Most reptiles lay eggs.
Examples of reptiles include snakes, lizards, alligators, and turtles.
Our class pet gecko is a reptile.
BirdsBirds are the only animals that have feathers. They are warm-
blooded and have wings, a beak, and two legs. They also lay eggs.
Not all birds fly! Some birds that don’t fly are penguins and ostriches.
Fun Fact: An ostrich is so fast it can outrun a horse!
OstrichPenguin
FishFish are cold-blooded animals that live in water. They have gills to
help them breathe and scales to help them move through the water.
Scientists believe there are more than 24,000 species of fish in the world.
Examples of fish include catfish, stingrays, swordfish, lion fish, scorpion
fish, and sharks.
Catfish
Stingrays
Swordfish
Lionfish
Scorpion Fish
Shark
Can you think
of more types
of fish?
An invertebrate is
an animal that
does not have a
backbone. Over
96% of the world’s
animals are
invertebrates.
Invertebrates
Examples of invertebrates include butterflies, grasshoppers,
worms, spiders, starfish, and squid.