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How Scientists Classify Animals
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Some scientists think there are 30 million different species or kinds of animals on Earth. Scientists sort or classify animals into groups by their characteristics.
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Its not an easy job, but scientists from all over the world try to search for new animal species every day.
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Take a look a
t
these newly
discovered
deep sea
creatures!
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To classify different type of animals into groups, scientist take a look at how they are alike and different.
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Classification
piglet
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Scientists classify animals that do not have backbones into a group called invertebrates. There are 10 groups of invertebrates:
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invertebrates
protozoa
flatworms
mollusks
Annelid worms
Coelenterates (jellyfish and sea anenome)
Echinoderms (starfish)
Arachnids (spiders and scorpions)
Crustaceans (Crabs and lobsters)
insects
Myriapods (starfish)
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Scientists classify some invertebrate together that have 6 legs. Sometimes they have wings. They do not have a backbone.
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dragonfly
Monarch butterfly
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Red ant
katydid
bumblebee
All of these animals have antennae. What is the name for this group of animals?
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If you guessed insects, you are right! Insects are the largest group of animals on Earth. There are so many species of insects that scientists are yet to discover them all.
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Someday yo
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the discove
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Scientific Checklist:
no backbone
6 legs
have antennae
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Scientists classify animals that have backbones into a group called vertebrates. There are 5 groups of vertebrates:
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vertebrates
birds
fish reptiles
mammals
amphibians
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One group of animals share some common characteristics. They have fur or hair on their bodies. They are warm-blooded.
Polar bear
gorilla
daschund
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They give live birth to their young. The babies drink milk from their mothers. Can you guess what animal group this is?
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Sea otters
deer deer
Sea otters
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Then you were right! Humans are mammals, too!
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Did you think
these were
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Scientific Checklist:
Have fur or hair
Warm-blooded
Give birth to live young
Babies drink their mothers milk
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Scientists group other animals together since they have feathers and wings.
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hummingbird
grosbeak
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They have beaks.
...and lay eggs. seagull
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But murres lay their eggs right on a rocky ledge.
You probably already know what name scientists call this group. What is it?
robin eggs
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Scientific Checklist:
Have feathers and wings.
Have beaks.
Babies hatch from eggs.
Warm-blooded
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Scientists group other animals together that have scales and swim in the water.
lionfish lionfish
grouper
shark
Even sharks are in this group. They are all called
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Scientific Checklist:
Have scales and fins
Cold-blooded
Use gills to breathe underwater
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People often have trouble distinguishing between the next two groups of animalsamphibians and reptiles.
Both reptiles and amphibians are cold-blooded and lay eggs.
Sea turtle
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But reptiles have scales and dry skin.
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Here are some reptiles. See how dry and scaly their skin is?
alligator
snake
Anole lizard
tortoise
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Scientific Checklist:
Have scales
cold-blooded
Young hatch from eggs
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Amphibians live on land and in the water. Amphibians usually have moist skin.
Photo taken by Jeri Faber
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Scientific Checklist:
Moist skin
Cold-blooded
Babies hatch from eggs
Live on land and water
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Ill give you 5 animals to classify. Youll need to list at least 2 reasons why you sorted the way you did. The answer for each is on the slide following.
Ready? created by Jeri Faber
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This adorable baby chipmunk will drink milk from its mother.
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I hope these wings will help it fly from the nest soon since it looks a little crowded!
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Amphibians lay eggs. Did you know it takes two years for bullfrog tadpoles to develop into frogs?
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Amphibians have moist skin!
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Clownfish use gills to breathe.
You probably noticed all of these scales on its skin. Take a look at the fins, too.
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Photo taken by Jeri Faber
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Photo taken by Jeri Faber
Reptiles hatch from eggs.
Reptiles have dry scaly skin!
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I can tell you have wha
t
it takes to be a great
biologist!
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Lets Review!
How do scientists classify animals?
What are the 5 classifications of animals with a backbone?
What is the largest group of animals on Earth?
What type of animal are you?
Why do you think scientists classify animals?
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