Figure 3.1 Cliff swallows are highly social

1. Chapter 3 Opener These immature leaffooted coreid bugs cluster together even though they face heightened competition for food and a greater risk of contracting a communicable disease

2. Figure 3.1 Cliff swallows are highly social

3. Figure 3.2 Effect of parasites on cliff swallow nestlings

4. Figure 3.3 Social behavior has an evolutionary history

5. Figure 3.3 Social behavior has an evolutionary history (Part 1)

6. Figure 3.3 Social behavior has an evolutionary history (Part 2)

7. Figure 3.4 Social life has costs and benefits

8. Table 3.1 Fitness consequences of social interactions between two individualsa

9. Figure 3.5 Mutual defense in a society of bluegills

10. Figure 3.6 A direct fitness benefit for helping in a paper wasp

11. Figure 3.6 A direct fitness benefit for helping in a paper wasp (Part 1)

12. Figure 3.6 A direct fitness benefit for helping in a paper wasp (Part 2)

13. Figure 3.7 Cooperation among competitors

14. Figure 3.8 Cooperative courtship of the long-tailed manakin

15. Figure 3.9 Cooperation with an eventual payoff

16. Figure 3.10 Reciprocity occurs in primates that groom one another

17. Figure 3.11 The prisoner’s dilemma

18. Figure 3.12 An alarmed Belding’s ground squirrel gives a warning call after spotting a terrestrial predator

19. Figure 3.13 Mobbing and kinship in groups of Siberian jays

20. Figure 3.13 Mobbing and kinship in groups of Siberian jays (Part 1)

21. Figure 3.13 Mobbing and kinship in groups of Siberian jays (Part 2)

22. Figure 3.14 Altruism and relatedness in pied kingfishers

23. Figure 3.14 Altruism and relatedness in pied kingfishers (Part 1)

24. Figure 3.14 Altruism and relatedness in pied kingfishers (Part 2)

25. Table 3.2 Calculations of inclusive fitness for male pied kingfishers

26. Figure 3.15 Purple-crowned fairy wrens are similar to pied kingfishers

27. Figure 3.16 Cooperation among scrub jay relatives

28. Figure 3.17 Seasonal changes in prolactin concentrations in (A) breeders and (B) nonbreeding helpers at the nest in the Mexican jay

29. Figure 3.17 Seasonal changes in prolactin concentrations in (A) breeders and (B) nonbreeding helpers at the nest in the Mexican jay (Part 1)

30. Figure 3.17 Seasonal changes in prolactin concentrations in (A) breeders and (B) nonbreeding helpers at the nest in the Mexican jay (Part 2)

31. Table 3.3 Effect of Florida scrub jay helpers at the nest on the reproductive success of their parents and on their own inclusive fitness

32. Figure 3.18 Helping in carrion crows boosts the reproductive success of the breeders

33. Figure 3.18 Helping in carrion crows boosts the reproductive success of the breeders (Part 1)

34. Figure 3.18 Helping in carrion crows boosts the reproductive success of the breeders (Part 2)

35. Figure 3.18 Helping in carrion crows boosts the reproductive success of the breeders (Part 3)

36. Figure 3.19 Helpers at the nest help raise more siblings

37. Figure 3.20 Dispersal by helper Seychelles warblers

38. Figure 3.20 Dispersal by helper Seychelles warblers (Part 1)

39. Figure 3.20 Dispersal by helper Seychelles warblers (Part 2)

40. Figure 3.21 Conditional reproductive tactics of female white-fronted bee-eaters

41. Figure 3.22 A mammal with an effectively sterile caste

42. Figure 3.23 Why do meerkats live in groups?

43. Figure 3.23 Why do meerkats live in groups? (Part 1)

44. Figure 3.23 Why do meerkats live in groups? (Part 2)

45. Figure 3.23 Why do meerkats live in groups? (Part 3)

46. Figure 3.24 Cooperative breeding in birds is linked to monogamy

47. Figure 3.25 Soldier aphids (on the left) compared with the aphids they live with and protect (on the right)