This document discusses how animals can be classified in multiple ways, including by their physical features, where they live, and how they act. It then focuses on classifying animals based on whether they have backbones or not. For vertebrates with backbones, it describes the main groups of fish, amphibians, reptiles, birds, and mammals based on their defining characteristics. For invertebrates without backbones, it outlines groups like sea jellies, worms, mollusks, and arthropods. Finally, it briefly discusses how different animals are born from eggs or through live birth.

1. How can
you
classify
animals?

2. Classify animals
how they look
Animals ca be classified by where they live
how they act

3. Animals can be classified by how
they 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.

4. One animal can be placed in 2 groups
eat mice fly
snake
hawk
owl
hawk
owl

5. 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.

6. Groups of
Vertebrates

7. Fish
1- Fish are vertebrates that live
in water.
2- Fish have slippery scales,
breathe through gills, and lay
eggs.
3- Fish are cold-blooded
vertebrates.

8. amphibians
frog toad salamander

9. amphibians
1- 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.

10. reptiles
snake lizard turtle crocodile

11. reptiles
1- reptiles are cold-blooded vertebrates.
2- they have dry scaly skin.
3- they breathe air through lungs .
4- most reptiles lay eggs.

12. birds
1- 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.

13. 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.

14. Animals without backbones

15. Invertebrates are animals without
backbones.
Sea star butterfly spider

16. 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.

17. Groups of
Invertebrates

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

19. worms
1- they are animals with long, soft
bodies and no legs.
2- worms help keep soil healthy.

20. mollusks
1- they are animals with soft bodies.
2- many mollusks have hard shells
and eyes.
Octopuses squids clams snails.

21. arthropods
1- an arthropod is an animal that has a hard
covering outside its body.
2- their legs have joints.
insects spider crab

22. Animal Birth

23. 1-Most animals begin in small
eggs.
2-The eggs grow to different
sizes.
3-The young animals are then
born in different ways.

24. eggs
Many 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.

26. Live Birth
live 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.