1．A Hawk 1
2．Air 2
3．Algae 4
4．An Ape 5
5．Animals and Aestivation 7
6．Animals and Men 10
7．Animals and Their Languages 12
8．Animals and Their Partners 14
9．Animals Can Be Made to Work for Men 16
10．Antarctica（Ⅰ） 18
11．Antarctica（Ⅱ） 20
12．Amoebas 21
13．Appearance of EL Ni？o 23
14．Apple Trees 25
15．A Tornado 26
16．A Trained Dog 28
17．A Tree Frog 30
18．Bamboo（Ⅰ） 32
19．Bamboo（Ⅱ） 34
20．Bats 36
21．Beavers（Ⅰ） 37
22．Beavers（Ⅱ） 39
23．Beavers（Ⅲ） 41
24．Birds that"See"with Their Ears 43
25．Butterflies 45
26．Can Animals Tell Colours? 47
27．Can Frogs Breathe under Water? 49
28．Can Trees Talk? 50
29．Cats（Ⅰ） 52
30．Cats（Ⅱ） 54
31．Clouds and Fogs 56
32．Cobra 58
33．Coconuts 60
34．Crocodiles 61
35．Deserts（Ⅰ） 63
36．Deserts（Ⅱ） 65
37．Dogs and Colours 67
38．Dolphins 69
39．Double Sun 71
40．Do You Talk to Plants? 72
41．Earthquakes 75
42．Earthworms 77
43．Elephants（Ⅰ） 78
44．Elephants（Ⅱ） 80
45．Elephants（Ⅲ） 82
46．Every Animal Is a Living Radiator 84
47．Fish Can Hear Sounds 86
48．Fish from the Deep 88
49．Fleas 90
50．Folk Weather Sayings 92
51．Foxes 94
52．Gorillas 95
53．Growing Plants Know Directions 98
54．How Do Animals Act towards Men? 100
55．How Do Bats Find Their Way in the Dark? 101
56．How Long Do Fishes Live? 103
57．How to Plant a Garden 104
58．How to Protect Animals 106
59．How to Transplant a Tree 108
60．Hurricanes 109
61．Icebergs 111
62．Jumping Mice 113
63．Koalas 115
64．Lightning 117
65．Man and the Sea 119
66．Men and Rats 121
67．Monkeys（Ⅰ） 123
68．Monkeys（Ⅱ） 124
69．Monkeys（Ⅲ） 126
70．Mosquitoes 128
71．Musical Sands 130
72．Orangutans 131
73．Owls 133
74．Pigeons 136
75．Rainfall（Ⅰ） 137
76．Rainfall（Ⅱ） 139
77．Sea Otters 140
78．Sea Worms 143
79．Shaking Fruit Trees Can Be a Real Art 144
80．Sharks 146
81．Snakes 148
82．Spiders 150
83．St. Bernard Dogs 152
84．The Age of a Tree 153
85．The Animal and Its Speed 155
86．The Ant Lion 157
87．The Ants 159
88．The Baboon 160
89．The Baobab Tree 162
90．The Basenji 163
91．The Bee 165
92．The Blue Tits 167
93．The Brown Bear 169
94．The Cactus 170
95．The Camel 172
96．The Chimpanzee 174
97．The Colours of the Ocean 177
98．The Dodo 179
99．The Eskimo Sled Dog 180
100．The Fiddler Crab 183
101．The Flying Fox（Ⅰ） 185
102．The Flying Fox（Ⅱ） 187
103．The Garter Snake 188
104．The Green Turtles 190
105．The Ideal City Tree 192
106．The Important Service of Trees to Man 193
107．The Interesting Giraffe 195
108．The Jackdaw 197
109．The Jaguar 199
110．The Leopard 200
111．The Lion 202
112．The Ocean and the Atmosphere 205
113．The Opossum 207
114．The Ostrich 208
115．The Panda 211
116．The Peppered Moth 213
117．The Pintail Ducks 215
118．The Piranha 217
119．The Praying Mantis 219
120．The Racoon 221
121．The Rattlesnake 222
122．The Sea 224
123．The Sea Horse 226
124．The Useful Mice 228
125．The Water-breathing Rats 229
126．The White-headed Leaf Monkey 231
127．Thunderstorms 233
128．Tigers 235
129．Travelling Rats 237
130．Tree Rings and Rainfall 239
131．Turtles 241
132．Two Existing Species of Bison 243
133．Volcanoes 245
134．Water（Ⅰ） 246
135．Water（Ⅱ） 248
136．Weasels 249
137．Whales（Ⅰ） 252
138．Whales（Ⅱ） 254
139．Whales（Ⅲ） 256
140．What Do We Do with the Fish? 258
141．Why Don't Birds Get Lost on Long Flights? 259
Key to the Tests 262
后记 264