1. Chapter 13 Opener: Weaver ants form superbly cooperative societies
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2. 13.1 The energy budget of “helpers” in Neolamprologus pulcher (Part 1)
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3. 13.1 The energy budget of “helpers” in Neolamprologus pulcher (Part 2)
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4. 13.2 Effect of removal of the top-ranked subordinate helper in a cooperatively breeding group
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5. 13.3 Reproductive interference in a social animal
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6. 13.4 Competition for food is a cost of sociality in the fieldfare
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7. 13.5 Effect of parasites on cliff swallow nestlings
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8. 13.6 Social living with defensive benefits?
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9. 13.7 Mutual defense in a society of bluegills
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10. 13.8 The different categories of helping behavior
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11. 13.9 Cooperation among competitors
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12. 13.10 Cooperative courtship of the long-tailed manakin
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13. 13.11 Cooperation with an eventual payoff
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14. 13.12 A meerkat sentinel on the alert for approaching predators
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15. 13.13 Reciprocity in a social primate
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16. 13.14 Experimental demonstration of reciprocity in cotton-top tamarins (Part 1)
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17. 13.14 Experimental demonstration of reciprocity in cotton-top tamarins (Part 2)
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18. 13.15 The prisoner’s dilemma
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19. 13.16 The components of selection and fitness
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20. 13.17 A Belding’s ground squirrel gives an alarm call after spotting a terrestrial predator
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21. 13.18 Altruism and relatedness in pied kingfishers
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22. 13.19 Cooperation among scrub jay relatives
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23. 13.20 Seasonal changes in prolactin concentrations in breeders and nonbreeding helpers (Part 1)
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24. 13.20 Seasonal changes in prolactin concentrations in breeders and nonbreeding helpers (Part 2)
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25. 13.21 Helpers at the nest help parents raise more siblings in the Florida scrub jay
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26. 13.22 Conditional reproductive tactics of female white-fronted bee-eaters (Part 1)
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27. 13.22 Conditional reproductive tactics of female white-fronted bee-eaters (Part 2)
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28. 13.23 Haplodiploid sex determination in Hymenoptera (Part 1)
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29. 13.23 Haplodiploid sex determination in Hymenoptera (Part 2)
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30. 13.23 Haplodiploid sex determination in Hymenoptera (Part 3)
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31. 13.24 Conflict within ant colonies over reproduction
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32. 13.25 A test of a hypothesis based on transactional theory
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33. 13.26 The effect of relatedness on equality of reproductive opportunities
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34. 13.27 Eusocial insects have sterile castes
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35. 13.28 Suicidal sacrifice by a worker bee
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36. 13.29 Eusociality has an evolutionary history
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37. 13.30 Haplodiploidy and the evolution of eusociality in the Hymenoptera (Part 1)
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38. 13.30 Haplodiploidy and the evolution of eusociality in the Hymenoptera (Part 2)
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39. 13.31 A sterile thrips soldier (right) next to a reproductive foundress female (left)
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40. Altruism in aphids
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41. 13.33 Selfish behavior of aphid clone invaders
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42. 13.34 A mammal with an effectively sterile caste
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43. 13.35 Fortress living space may provide an incentive against dispersal in many eusocial insects
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