1 What are vertebrates? 2
2 What are fish? 4
3 What are jawless fish and cartilaginous fish? 6
4 What are bony fish? 10
5 What are the systems of bony fish? 14
6 What are amphibians? 18
7 What are frogs and toads? 20
8 What are salamanders and newts? 22
9 What are the systems of amphibians? 24
10 What are reptiles? 26
11 What are lizards and snakes? 28
12 What are turtles and tortoises? 30
13 What are alligators and crocodiles? 32
14 What are the systems of reptiles? 34
15 What are birds? 36
16 What are flightless birds? 40
17 What are other types of birds? 42
18 What are the systems of birds? 46
19 What are mammals? 50
20 What are placental mammals? 54
21 What are marine mammals? 58
22 What are non-placental mammals? 62
23 What are egg-laying mammals? 64
24 How do people and animals relate to each other? 66
  Lots of Science Library Books 69
  Graphics Pages 143

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