ANIMALS ARE LIVING THINGS
Animals are born, grow, reproduce and die.
Animals need food, water and oxygen to stay alive.
We can classify animals into two big groups:
-Vertebrate animals: they have a skeleton or backbone inside.
-Invertebrate animals: they don't have a skeleton or backbone inside.
VERTEBRATE ANIMALS
They have a skeleton inside.
They are divided into 5 groups: mammals, birds, reptiles, amphibians and fish.
1. Mammals
* Mammals are viviparous.
* They give birth and they have live babies.
* Mammals drink their mother ́s milk.
* Mammals have hair or fur.
* Most mammals have four legs.
* Mammals breathe with their lungs.
2. Birds
*Birds are oviparous. They lay eggs.
*Birds have two legs, two wings and a beak.
*Birds have feathers. Most birds can fly.
*Birds breath with lungs.
3. Reptiles
*Reptiles are oviparous. They lay eggs.
*Some reptiles have legs and some have no legs.
*Reptiles have scales or a shell.
*Reptiles are cold-blooded.
*Reptiles breathe their lungs.
4. Amphibians
*Amphibians are oviparous and lay eggs in the water!
*Amphibians have wet or moist skin.
*Baby amphibians live in the water. Adults live on land.
5. Fish
*Fish are oviparous.
*They lay eggs.
*Fish live in the water.
*Fish have scales and fins.
*Fish breathe with their gills.
INVERTEBRATE ANIMALS
They don't have a skeleton inside.
Some of them have soft bodies; others have a shell or exoskeleton to protect their bodies.
All invertebrates are oviparous: they lay eggs.
We can classify invertebrates into: arthropods and molluscs.
Arthropods
*Most live on land.
*They have many legs.
*They have a hard body or exoskeleton.
Molluscs
*Most live in water
*They have soft bodies, but some have shells or tentacles.
