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Classification of Animals
© Diane Hawkins
Graphics by kind permission from PC Advisor 10,000 Clipart March 1999 Cover CD ROM
Adapted for use in the classroom by K. McMahon Blow 2009
Classification of Animals
Scientists have divided the Animal
Kingdom into two main groups:
Vertebrates
(animals with a backbone)
and
Invertebrates
(animals without a backbone)
Vertebrates
Animals with backbones can be divided into five
more groups:
Mammals
Birds
Amphibians
Reptiles
Fish
Invertebrates
Animals without a backbone.
Animals with Soft Bodies
Some invertebrates have bodies
that do not have any hard parts
(earthworms, jellyfish, slugs, and
octopuses). Some live on land, others
live in water.
Invertebrates
Including sponges, worms,
snails, jellyfish, clams,
starfish, crabs, insects,
and spiders.
Animals with Hard Shells
Have you ever seen a seashell?
Shells are all that is left of
invertebrates that had hard
shells (clams, mussels, oysters,
scallops, and snails).
Animals with an Exoskeleton
An exoskeleton is a hard outer covering
that protects an animal’s soft body
parts inside (lobsters, crabs, crayfish,
shrimp, ticks, scorpions, insects, and
spiders.
Vertebrates
Animals with a backbone.
All vertebrates have an internal skeleton
called an endoskeleton.
Mammals
•Give birth to live young.
•Feed their babies with
their own milk.
•Are more or less
covered with hair.
•Are warm-blooded.
Warm-blooded creatures, like mammals and birds, try to keep the
inside of their bodies at a constant temperature. They do this by
generating their own heat when they are in a cooler environment, and by
cooling themselves when they are in a hotter environment. To generate
heat, warm-blooded animals convert the food that they eat into energy.
Birds
• Have feathers.
• Are warm-blooded.
• Lay eggs.
Reptiles
• Are cold-blooded.
• Lay eggs.
• Have a dry skin
covered with scales.
Cold-blooded creatures take on the temperature of their surroundings.
They are hot when their environment is hot and cold when their
environment is cold. Cold-blooded animals are much more active in warm
environments and are very sluggish in cold environments. This is because
their muscle activity depends on chemical reactions which run quickly
when it is hot and slowly when it is cold.
Amphibians
• Are cold-blooded.
• Lay eggs.
• Have a smooth,
moist skin.
• Are able to live on
land as well as in
the water.
Fish
• Are cold-blooded.
• Lay eggs (but some
do give birth to live
young).
• Have a moist skin
covered in scales.
• Breathe through
gills.
What am I?
Mammal, Bird, Fish, Amphibian or
Reptile?
I am a mammal. My body is warm and furry. I
feed my babies on milk. I give birth to live
young.
What am I?
Mammal, Bird, Fish, Amphibian
or Reptile?
I am a mammal. My body is covered in hair, or
fur. I feed my babies on milk. I give birth to
live young.
What am I?
Mammal, Bird, Fish, Amphibian or
Reptile?
I am an amphibian. My body is moist and
smooth. I lay eggs. I like to live in or near to
water.
What am I?
Mammal, Bird, Fish, Amphibian or
Reptile?
I am a bird. My body is warm and
covered with feathers. I lay eggs which
hatch out into chicks.
What am I?
Mammal, Bird, Fish, Amphibian or
Reptile?
Although I have wings, I am in fact a mammal.
My body is covered in hair, not feathers. I
feed my babies on milk. I do not lay eggs.
What am I?
Mammal, Bird, Fish, Amphibian or
Reptile?
I am a mammal. If you stand very close to me,
you will see I have hairs on my body. I feed
my babies on milk. I do not lay eggs.
What am I?
Mammal, Bird, Fish, Amphibian or
Reptile?
I am a reptile. My body is covered in dry
scales. I lay eggs.
What am I?
Mammal, Bird, Fish, Amphibian or
Reptile?
I am a bird. My body is warm and
covered with feathers. I lay eggs which
hatch out into chicks.
What am I?
Mammal, Bird, Fish, Amphibian or
Reptile?
I am a fish. My body is cold to touch and is
covered in scales. I lay eggs. I use gills to
breathe with under water.
What am I?
Mammal, Bird, Fish, Amphibian or
Reptile?
I am a reptile. My body is covered in dry
scales. I lay eggs.
What am I?
Mammal, Bird, Fish, Amphibian or
Reptile?
I am an amphibian. My body is moist and smooth.
I lay eggs. I like to live in or near to water.
What am I?
Mammal, Bird, Fish, Amphibian or
Reptile?
I am a mammal. My body is warm and furry. I
feed my babies on milk. I give birth to live
young.
What am I?
Mammal, Bird, Fish, Amphibian or
Reptile?
I am a reptile. My body is covered in dry
scales. I lay eggs.
What am I?
Mammal, Bird, Fish, Amphibian or
Reptile?
I am a fish. My body is cold to touch and is
covered in scales. I lay eggs. I use gills to
breathe with under water.