This document discusses the five main groups of vertebrates: mammals, fish, amphibians, reptiles, and birds. Vertebrates are animals that have backbones and internal skeletons. They can be classified into these five groups based on key distinguishing characteristics. Mammals are warm-blooded and make milk to feed their young. Fish live entirely in water, breathe through gills, and have fins and scales. Amphibians spend part of their life cycle in water and part on land, laying eggs in water and breathing through gills as larvae.

1. World of
Vertebrates

2.  How many animals are there?
 Almost all living things are made up of either
animals or plants. There are 2 ways to tell them
apart:
1. Animals move around. Most plants are held by
their roots.
2. Animals find their food. Most plants make their
own food.
The animal world is divided into 2 groups. Animals
with backbone are called vertebrates.
Animals without backbone are called invertebrates.

3. Vertebrates
 Each vertebrate has an
inside skeleton
 A vertebrate’s skeleton
is the backbone and all
the other bones

4. Backbone
 The backbone is like a string of bones that
are close together. When you pet your cat or
dog, you can feel their backbone.

5. The animals that have bones can
be classifed into five different
groups.

7. 1. The
Mammals

9. Mammals are alike in5 ways:
1. Make milk
2. They have hair
3. They have limbs
4. Warm blooded
5. Have lungs to breath

12. 2. Fish

13. Fish
 Lives in the water their entire life
 Covered with scales
 Smell well, but has poor hearing.
 Instead of hearing they feel vibrations.

14. Fish are alike in 3 ways:
1. Gills
2. Fins
3. Cold bloded

18. 3. Amphibians

19. Amphibians
 Amphibians are a class of animals that spend the
first part of their life in the water. Then some
can live on the land.
 They lay their eggs in the water.
 When the eggs grow they breath using their gills
then eventually develop lungs.
 The parents do not take care of the young at all.

20. Amphibians
 They are cold blooded.
 They do not have scales.
 Amphibian means “double- life”. They
spend their life on land and water.