1. UNIT 3. ANIMALS

2. VERTEBRATES AND INVERTEBRATES
DIFFERENCES:
Vertebrates have got a backbone and invertebrates do not have a backbone.

3. VERTEBRATES’ GROUPS
Mammals birds reptiles Amphibians fish

4. MAMMALS I Physical characteristics -Most mammals live on land.
-Most mammals have got 4 legs.

5. MAMMALS I Physical characteristics
-Most mammals have fur to keep them warm
FUR

6. MAMMALS I Physical characteristics CURIOSITY!
-Some mammals live in water
-They use flippers to move
Dolphins are mammals

7. MAMMALS II NUTRITION Mammals can be: All baby mammals drink their
Carnivores: They eat other animals
Herbivores: They eat grass, fruits or plants
Omnivores: They eat both
All baby mammals drink their
mother’s milk

8. MAMMALS III
RESPIRATION All mammals breathe with lungs.

9. MAMMALS Iv REPRODUCTION Almost all mammals are viviparous.
Their babies are born from their
mothers.

10. BIRDS I Physical characteristics Most birds can fly
They have wings, tail and feathers
Feathers keep them warm
FEATHERS

11. BIRDS I Physical characteristics Birds have light and hollow bones
They have a beak for eating

12. BIRDS II
Nutrition
Like mammals they can be: carnivores, herbivores or omnivores.
Adult birds feed their chicks

13. BIRDS III
Respiration
Birds breathe with their lungs

14. BIRDS IV REPRODUCTION Birds are oviparous
They reproduce by laying eggs

15. REPTILES I PHYSICAL CHARACTERISTICS Reptiles have scales
Provide them camouflaje
Protect them from injury

16. REPTILES I PHYSICAL CHARACTERISTICS Most reptiles have arms and legs
They use arms and legs to run
Other reptiles swim
Snakes have no legs, they slither

17. REPTILES II NUTRITION Almost all reptiles are carnivores
Some of them are omnivores

18. REPTILES III Reptiles, like mammals and birds breathe with lungs
RESPIRATION
Reptiles, like mammals and birds breathe with lungs

19. REPTILES IV
REPRODUCTION
Most reptiles are oviparous

20. AMPHIBIANs I PHYSICAL CHARACTERISTICS
amPHIBIANS DO NOT HAVE SCALES. THEY HAVE MOIST SKIN.
Through their skin they absorb oxygen.

21. AMPHIBIANS I PHYSICAL CHARACTERISTICS Frogs are amphibians.
The cicle of the frog:
Frogs lay eggs
Tadpoles hatch from the eggs
The tadpoles grow back eggs
They grow front legs
Finally, they lose their tale and move on to the land

22. AMPHIBIANS II NUTRITION
Most amphibians are carnivores. They usually eat mosquitoes.

23. AMPHIBIANS III RESPIRATION Baby amphibians breathe through gills
Adult amphibians breathe with lungs

24. AMPHIBIANS IV
REPRODUCTION
Amphibians are oviparous. They lay egg.

25. FISH i Fish have scales like reptiles do.
PHYSICAL CHARACTERISTICS
Fish have scales like reptiles do.
The scales protect them from injury.
They have fins to swim.
FINS

26. FISH iI
Nutrition
Fish can be carnivores, herbivores and omnivores

27. FISH iii Fish need oxygen.
RESPIRATION
Fish need oxygen.
They take the oxygen from water using their gills.

28. FISH iv Reproduction Almost all fish are oviparous.
They lay eggs under water.