Biochemical determination of parental uncertainty in white-fronted bee-eaters Peter H. WregeStephen T. Emlen OriginalPaper Pages: 153 - 160
Evolution of variation in male secondary sexual characteristics Torbjörn JärviEivin RøskaftBrigitta Zumsteg OriginalPaper Pages: 161 - 169
Cooperative breeding in purple gallinules: the role of helpers in feeding chicks Laurie A. Hunter OriginalPaper Pages: 171 - 177
The role of learning in the mating biology of a sweat bee Lasioglossum zephyrum (Hymenoptera: Halictidae) William T. Wcislo OriginalPaper Pages: 179 - 185
Footdrumming and other anti-predator responses in the bannertail kangaroo rat (Dipodomys spectabilis) Jan A. RandallClaudia M. Stevens OriginalPaper Pages: 187 - 194
Influences of aggregative behaviour on space occupation in the spider Zygiella x-notata (Clerck) Raymond LeborgneAlain Pasquet OriginalPaper Pages: 203 - 208
The kin recognition system of carpenter ants (Camponotus spp.) Norman F. CarlinBert Hölldobler OriginalPaper Pages: 209 - 217
The kin recognition system of carpenter ants (Camponotus spp.) Norman F. CarlinBert HölldoblerDavid S. Gladstein OriginalPaper Pages: 219 - 227