LIST OF ILLUSTRATIONS 
TO PACE 
PAGE 
The Chimpanzee’s Top Note . . Frontispiece 
The Howler, the Noisiest of all Monkeys . . 16 
A Tuco-Tuco—Its Voice resembles the Sound Pro¬ 
duced by Beating upon an Anvil . . .16 
The Naked-throated Bell-bird remarkable for its 
Powerful Voice ...... 17 
The American Bowfin, that Utters Bell-like Sounds 17 
The Bull-snake, that Possesses a Powerful Voice . 17 
The Three-spined Stickleback makes a Muff-shaped 
Nest ........ 32 
The Paradise Fish, that makes a Nest of Bubbles 32 
A Pipe-fish ........ 32 
A Sea-horse . . . . . . .33 
The Chameleon, famed for its Colour-changing Powers 33 
An Arctic Fox in Winter Dress .... 64 
The Beak of a Hornbill is not so Heavy as it Looks 64 
The Toucan Possesses an Enormous and Brightly- 
coloured Beak ...... 65 
A Shoebill or Whale-headed Heron ... 65 
The Boat-billed Heron ..... 80 
The Spoonbill Possesses a Unique Type of Beak . 80 
The Bill of the Flamingo is unlike that of any other 
Bird.81 
The Greater Frigate-bird—both Mandibles of the 
Beak are Bent Downwards at the Tip . 
11 
81 
