The Evolution of Desert Adaptations. 190 A Comparison of Behavior Patterns. . 196 A Comparison of Behavior Patterns in: Meriones, Gerbillus and Perognathus . . . . . 210 Spacing and Communication 217 Acknowledgements 221 References . . . . . . . . 221 XI. Activity Patterns ofa Desert Rodent by N. R. FRENCH 225 Introduction . . . . . . . . . . . . . . . 225 Methods. . . . . . . . . . . . . . . . . 226 The Microdosimeter and the Index of Activity. 227 Variation in Activity. . . . . . . . . . . . 229 Climatological Variables and Animal Activity . 229 Analysis . 232 Discussion 237 Summary 238...