Foraging in the seed-harvester ant genus Pogonomyrmex: are energy costs important? Jonathon A. WeierDonald H. Feener Jr OriginalPaper Pages: 291 - 300
Sex ratios, mating behavior and sexual size dimorphism of the northern water snake, Nerodia sipedon Patrick J. WeatherheadFrances E. BarryMark R. L. Forbes OriginalPaper Pages: 301 - 311
Mating system and mating success of the desert spider Agelenopsis aperta Fred SingerSusan E. Riechert OriginalPaper Pages: 313 - 322
Social dominance in migrant and resident turkey vultures at carcasses: evidence for a despotic distribution? David A. KirkDavid C. Houston OriginalPaper Pages: 323 - 332
Kinship and social tolerance among female and juvenile wild house mice: kin bias but not kin discrimination Jane L. HurstC. J. Barnard OriginalPaper Pages: 333 - 342
Joint brood guarding in parent bugs — an experiment on defence against predation Johanna MappesArja KaitalaRauno V. Alatalo OriginalPaper Pages: 343 - 347
Extra-pair paternity in willow ptarmigan broods: measuring costs of polygyny to males J. R. FreelandS. J. HannonP. T. Boag OriginalPaper Pages: 349 - 355
Extra-pair paternity, sperm competition and the evolution of testis size in birds A. P. MollerJ. V. Briskie OriginalPaper Pages: 357 - 365