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Classification of
Animals
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What is an animal?
• Animals are multicellular organisms that
eat other organisms for food.
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How do we classify
animals?
• Animals are classified by breaking them into smaller groups based on their similarities and differences.
• Some questions scientists ask: – Do they have a backbone?
– What kind of skin do they have?
– Are they warm or cold blooded?
– How do they breathe?
– How are they born?
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How do we break animals
into groups?
• Animals are broken into two large groups:
Vertebrates and Invertebrates
• Vertebrates have a backbone.
Vertebrates make up 5% of all animals.
• Invertebrates do not have a backbone.
They make up 95% of all animals.
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Invertebrate Classes
• Mollusks
• Annelids
• Echinoderm
• Arthropod
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Some Examples of
Invertebrates
• Mollusks – snails, clams, oysters, squid
• Annelids - earthworms, clamworms,
leeches
• Echinoderm – sea stars, sand dollars, sea
urchins
• Arthropods – insects, spiders,
scorpions, lobsters, ticks
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What about Vertebrates?
• Vertebrates are broken into five groups
(classes): Fish, Reptiles, Birds,
Mammals, and Amphibians.
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What makes a fish a fish?
• Fish usually…
– Have scales
– Use gills to breathe
– Are hatched from eggs
– Are cold blooded
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Some Examples of Fish
• Piranha
• Shark
• Angelfish
• Seahorse
• Stingray
• Eel
• Tuna
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What makes a reptile a
reptile?
• Reptiles usually…
– Have scales
– Use lungs to breathe
– Hatched from eggs
– Are cold blooded
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Some Examples of Reptiles
• Alligators
• Crocodiles
• Snakes
• Lizards
• Turtles
• Tortoises
• Geckos
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What makes a bird a bird?
• Birds usually…
– Have feathers
– Use lungs to breathe
– Are hatched from eggs
– Are warm blooded
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Some Examples of Birds
• Penguin
• Ostrich
• Toucan
• Crane
• Owl
• Goose
• Hummingbird
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What makes a mammal a
mammal?
• Mammals usually…
– Have hair
– Use lungs to breathe
– Are born live (not hatched from eggs)
– Are warm blooded
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Some Examples of Mammals
• Whales
• Dolphins
• Cats
• Dogs
• Gorillas
• Horses
• Wolves
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What makes an amphibian
an amphibian?
• Amphibians usually… – Have moist
smooth skin
– Use gills when young and lungs as adults
– Hatched from eggs
– Are cold blooded
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Some Examples of
Amphibians
• Frogs
• Newts
• Toads
• Salamander
• Caecillian