This document divides animals into two main groups: invertebrates, which lack backbones, and vertebrates, which have backbones. Vertebrates are further divided into five classes: fish, amphibians, reptiles, birds, and mammals. Each class is described in one to three sentences, noting key distinguishing characteristics like their habitat, anatomy, and reproduction methods. Examples of common animals in each class are also provided.

2. Animals and their Groups

3. 1. Invertebrates- animals without
backbones.
1. Vertebrates- animals with
backbones.

4. 5 Classes of
Vertebrates

5. 1.Fish
Fish are the simplest form of vertebrates.
Their body parts are adopted for life in
water. Their gills take in oxygen from water.
They reproduce by laying eggs.
Example: shark, dolphin, tuna, clownfish

6. 2. Amphibians
Amphibians can live in land and water. As
they grow, their gills disappeared, and lungs
take their place. Their take their oxygen in
two ways either in lungs or skin.
Example: frog, salamander, toad

7. 3. Reptiles
The body of reptiles are covered with scales
and hard body plates. It is cold blooded
animals. All reptiles have lungs. Most of
them live in land, some in water and others
in desert.
Example: crocodile, lizard, snake, turtle

8. 4. Birds
All birds have pairs of wings. Although some
birds do not fly. Birds have two legs for
walking, Their bodies are covered with
feathers which keep them warm. They
reproduce by laying eggs.
Example: ostrich, chicken, parrot

9. 5. Mammals
Mammals are the most highly developed
among the groups of vertebrates. Their
bodies are covered with hair and furs. They
have mammary glands that produce milk
which they use to feed their young.
Mammals reproduce by giving birth.
Example: human, dog, horse, elephant

10. Invertebrates
1. Insects
Insects are the largest group of vertebrates.
Insects are animals with six legs. They use their
legs in moving and holding their food. Most of
them have one or two pairs of wings which they
also use in moving from one place to another.
Example: ant, butterfly, mosquito, bug,
caterpillar