1. Chapter 5 Opener: Male red-sided garter snakes emerging from hibernation are ready to mate
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2. 5.1 Different courtship displays of the male ring dove are under the control of different hormones
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3. 5.2 Nervous system of a praying mantis
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4. 5.3 A no-brainer
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5. 5.4 Nervous system and digestive system of a blowfly
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6. 5.5 Record of neural and behavioral activity of a calling cricket
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7. 5.6 Circadian rhythms in cricket calling behavior
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8. 5.7 The cricket nervous system
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9. 5.8 A master clock may regulate mechanisms controlling circadian rhythms within individuals
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10. 5.9 The genetics of biological clocks in mammals and fruit flies (Part 1)
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11. 5.9 The genetics of biological clocks in mammals and fruit flies (Part 2)
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12. 5.10 Mutations of the per gene affect the circadian rhythms of fruit flies
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13. 5.11 Expression of the gene that codes for PK2 in the SCN
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14. 5.12 Circadian control of wheel-running by white rats changes when the rats are injected with PK2
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15. 5.13 Naked mole-rats lack a circadian rhythm
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16. 5.14 Circannual rhythm of the golden-mantled ground squirrel
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17. 5.15 Circannual rhythm in a stonechat (Part 1)
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18. 5.15 Circannual rhythm in a stonechat (Part 2)
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19. 5.16 Lunar cycle of banner-tailed kangaroo rats
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20. 5.17 A cycle of photosensitivity
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21. 5.18 A hormonal response to light
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22. 5.19 Food intake and reproductive timing in the white-winged crossbill
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23. 5.20 Photoperiod affects testis size in the red crossbill
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24. 5.21 Regulation of infanticide by male house mice (Part 1)
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25. 5.21 Regulation of infanticide by male house mice (Part 2)
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26. 5.22 A hormonal effect on infanticidal behavior in laboratory mice
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27. 5.23 Testosterone and progesterone levels in two categories of male California mice
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28. 5.24 Testosterone and the control of sexual motivation in male Japanese quail (Part 1)
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29. 5.24 Testosterone and the control of sexual motivation in male Japanese quail (Part 2)
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30. 5.25 An associated reproductive pattern
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31. 5.26 Digitally produced variation in male facial features
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32. 5.27 Hormonal and behavioral cycles in single-brood and multiple-brood populations
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33. 5.28 The effects of castration followed by testosterone therapy on three male guinea pigs
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34. 5.29 Testosterone and female aggression in the dunnock
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35. 5.30 The chemical structure of testosterone and its diverse effects on physiology and behavior
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36. 5.31 A survival cost of testosterone
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37. 5.32 Testosterone and territorial behavior (Part 1)
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38. 5.32 Testosterone and territorial behavior (Part 2)
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39. 5.33 Estrogen and territorial behavior
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40. 5.34 Spring mating aggregation of red-sided garter snakes
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41. 5.35 Testosterone and the long-term maintenance of mating behavior
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