LIST OF ILLUSTRATIONS 



PACK 



TRAP-DOOR SPIDfeRS . Frontispiece 



POCKET-GOPHERS . . . ... 46 



PRAIRIE-MARMOTS . . . ... 50 



ROBBER-CRABS . . . . ... 64 



CHIMPANZEES AT HOME . . . ... 90 



STICKLEBACKS . . . . ... 102 



ANTS' NEST . . . . ... no 



ALBATROS-NESTING . . . . . . 127 



MALLEE-BIRD'S MOUND . . . . . . 131 



