1. A simple learning strategy that realizes robust cooperation better than Pavlov in Iterated Prisoners' Dilemma

   • J. Y. Wakano
   • N. Yamamura

   ARTICLE Pages: 1 - 8

2. Can voluntary nutritional gifts in seminal flow evolve?

   • T. Kura
   • K. Yoda

   ARTICLE Pages: 9 - 15

3. Activity budgets of wild female chimpanzees in different reproductive states

   • A. Matsumoto-Oda
   • R. Oda

   ARTICLE Pages: 17 - 21

4. Foraging behavior of the American oystercatcher Haematopus palliatus pitanay (Murphy 1925) on the intertidal ascidian Pyura praeputialis (Heller 1878) in the Bay of Antofagasta, Chile

   • C. J. Pacheco
   • J. C. Castilla

   ARTICLE Pages: 23 - 26

5. Apparent decoupling of prey recognition ability with prey availability in an insular snake population

   • K. Tanaka
   • A. Mori
   • M. Hasegawa

   ARTICLE Pages: 27 - 32

6. Heritability of male secondary sexual traits in feral guppies in Japan

   • K. Karino
   • Y. Haijima

   ARTICLE Pages: 33 - 37

7. Incubation ability of the functional envelope in paper wasp nests (Hymenopteta, Vespidae, Polistes): I. Field measurements of nest temperature using paper models

   • S. Hozumi
   • S. Yamane

   ARTICLE Pages: 39 - 46

8. Overlapping oviposition and chemical defense of eggs in two co-occurring species of ladybird predators of aphids

   • B. K. Agarwala
   • H. Yasuda

   ARTICLE Pages: 47 - 53

9. Why are there feeding and nonfeeding larvae in phytoseiid mites (Acari, Phytoseiidae)?

   • A. R. Chittenden
   • Y. Saito

   ARTICLE Pages: 55 - 62

10. Egg-depositing behavior as a predator avoidance tactic of Yezonychus sapporensis Ehara (Acari, Tetranychidae)

    • H. Yanagida
    • Y. Saito
    • A. R. Chittenden

    ARTICLE Pages: 63 - 66