How can you

classify animals?

Classify animals

how they look

Animals ca be classified by where they live

how they act

Animals can be classified by howthey look. Scientists identify

body features=long ears or short fur, to classify animals.

Trait is a feature passed on to a living thing from its parents.

One animal can be placed in 2 groups

eat mice fly

snake

hawk

owl

hawk

owl

Animals with backbones

Vertebrate is an animal with a backbone.(cats, birds, and fish).

All vertebrates have backbone and other bones.

Bones grow as the animals grow. Bones support the body. This allows vertebrates to grow very big.

Groups of Vertebrates

Fish1- Fish are vertebrates that live in water. 2- Fish have slippery scales, breathe through gills, and lay eggs.

3- Fish are cold-blooded vertebrates.

amphibiansfrog toad salamander

amphibians1- amphibians are cold-blooded vertebrates.

2- they have smooth, moist skin. They hatch from eggs.

3- young amphibians live in water and get oxygen through their gills and skin.

4- they develop lungs to breathe air out of the water.

reptiles

crocodileturtlelizardsnake

reptiles

1- reptiles are cold-blooded vertebrates.

2- they have dry scaly skin.

3- they breathe air through lungs .

4- most reptiles lay eggs.

birds1- birds are warm-blooded vertebrates with feathers and bills.

2- feathers help birds stay warm.

3- wings and light bones help most birds fly.

4- they breathe air through lungs .

5- all birds hatch from eggs.

mammals

1- mammals are warm-blooded vertebrates.

2- they have hair that keeps them warm.

3- they breathe air through lungs and feed milk to their young.

4- they are born alive instead of hatching from eggs.

Animals without backbones

Invertebrates are animals without backbones.

Sea star butterfly spider

A soft sac filled with liquid supports worms and sea jellies.

A hard shell supports clams and lobsters.

Insects have a hard covering on the outside of their bodies.

Groups of Invertebrates

Sea jellies

1- they have soft bodies and long, stinging body parts.2- the body of a sea jelly is made ofwater.3- a sea jelly stuns its prey before pulling it into its stomach.4- Most sea jellies live in the ocean.

worms

1- they are animals with long, soft bodies and no legs.

2- worms help keep soil healthy.

mollusks1- they are animals with soft bodies.2- many mollusks have hard shells and eyes.

Octopuses squids clams snails.

arthropods1- an arthropod is an animal that has a hard covering outside its body.

2- their legs have joints.

insects spider crab

Animal Birth

1-Most animals begin in smalleggs.2-The eggs grow to differentsizes.3-The young animals are then born in different ways.

eggsMany animals hatch from eggs.1- all birds hatch from eggs.2- most fish, amphibians, and reptiles hatch from eggs.3- crocodiles lay eggs.

After growing in the eggs for 2 or 3 months, young crocodiles hatch from the eggs.

Live Birthlive birth: when the young animal is born instead of hatching from an egg.A lion gave live birth to the cubs after being pregnant for about 4 months.