1. Foraging in the seed-harvester ant genus Pogonomyrmex: are energy costs important?

   • Jonathon A. Weier
   • Donald H. Feener Jr

   OriginalPaper Pages: 291 - 300

2. Sex ratios, mating behavior and sexual size dimorphism of the northern water snake, Nerodia sipedon

   • Patrick J. Weatherhead
   • Frances E. Barry
   • Mark R. L. Forbes

   OriginalPaper Pages: 301 - 311

3. Mating system and mating success of the desert spider Agelenopsis aperta

   • Fred Singer
   • Susan E. Riechert

   OriginalPaper Pages: 313 - 322

4. Social dominance in migrant and resident turkey vultures at carcasses: evidence for a despotic distribution?

   • David A. Kirk
   • David C. Houston

   OriginalPaper Pages: 323 - 332

5. Kinship and social tolerance among female and juvenile wild house mice: kin bias but not kin discrimination

   • Jane L. Hurst
   • C. J. Barnard

   OriginalPaper Pages: 333 - 342

6. Joint brood guarding in parent bugs — an experiment on defence against predation

   • Johanna Mappes
   • Arja Kaitala
   • Rauno V. Alatalo

   OriginalPaper Pages: 343 - 347

7. Extra-pair paternity in willow ptarmigan broods: measuring costs of polygyny to males

   • J. R. Freeland
   • S. J. Hannon
   • P. T. Boag

   OriginalPaper Pages: 349 - 355

8. Extra-pair paternity, sperm competition and the evolution of testis size in birds

   • A. P. Moller
   • J. V. Briskie

   OriginalPaper Pages: 357 - 365