The evolution of non-maternal caretaking among anthropoid primates: do helpers help? John C. MitaniDavid Watts Pages: 213 - 220
Female mate choice in the non-territorial lizard Ameiva plei (Teiidae) Ellen J. Censky Pages: 221 - 225
Neighbours, strangers and male-male aggression as a determinant of lek size D. A. Westcott Pages: 235 - 242
The structural significance of a vocalization that stimulates gaping in black-capped chickadees Janine R. Clemmons Pages: 243 - 251
Non-adaptive adoptions of nestlings in the colonial lesser kestrel: proximate causes and fitness consequences José L. TellaManuela G. ForeroFernando Hiraldo Pages: 253 - 260
Relatedness, polyandry and extra-group paternity in the cooperatively-breeding white-browed scrubwren (Sericornis frontalis ) Linda A. WhittinghamPeter O. DunnRobert D. Magrath Pages: 261 - 270
Lack of kin recognition in swarming honeybees ( Apis mellifera ) Per KrygerRobin F. A. Moritz Pages: 271 - 276