1. Patterns of extra-pair fertilizations in bobolinks

   • Eric K. Bollinger
   • Thomas A. Gavin

   OriginalPaper Pages: 1 - 7

2. Armed sibling rivalry among suckling piglets

   • David Fraser
   • B. K. Thompson

   OriginalPaper Pages: 9 - 15

3. Sources of variation in male mating success and female oviposition rate in a nonterritorial dragonfly

   • N. K. Michiels
   • A. A. Dhondt

   OriginalPaper Pages: 17 - 25

4. Testes size and breeding systems in Japanese annrans with special reference to large testes in the treefrog, Rhacophorus arboreus (Amphibia : Rhacophoridae)

   • Tamotsu Kusano
   • Mitsuhiko Toda
   • Kinji Fukuyama

   OriginalPaper Pages: 27 - 31

5. The effect of postcopulatory male behaviour on ejaculate distribution within the female sperm storage organs of the fly, Dryomyza anilis (Diptera : Dryomyzidae)

   • M. Otronen
   • M. T. Siva-Jothy

   OriginalPaper Pages: 33 - 37

6. The basis for female choice in an avian brood parasite

   • D. A. Yokel
   • S. I. Rothstein

   OriginalPaper Pages: 39 - 45

7. Correlates of male mating success in two species of Anthidium bees (Hymenoptera : Megachilidae)

   • Ethel M. Villalobos
   • Todd E. Shelly

   OriginalPaper Pages: 47 - 53

8. Song output and stimulation of the female in white-throated sparrows

   • F. E. Wasserman
   • J. A. Cigliano

   OriginalPaper Pages: 55 - 59

9. Brood defense and age of young: a test of the vulnerability hypothesis

   • Holger Onnebrink
   • Eberhard Curio

   OriginalPaper Pages: 61 - 68

10. Pigeon homing: new airbag experiments to assess the role of olfactory information for pigeon navigation

    • Jörg U. Ganzhorn
    • Joachim F. Burkhardt

    OriginalPaper Pages: 69 - 75