The handicap principle: a missing piece of Darwin's puzzle

1. Prey-predator interactions.

2. Communication between rivals.

3. Mate selection.

4. The fallacy of species-specific signals.

5. Movements and ritualization.

6. Vocalizations.

7. Body parts that serve as signals.

8. The use of color for showing off.

9. Chemical communications.

10. Testing the bond.

11. Parents and offspring.

12. Babblers, competition for prestige, and the evolution of altruism.

13. The social insects: why help the queen?

14. The parenting couple.

15. Social amebas (cellular slime molds).

16. Parasite and host.

17. Information centers.

18. Humans.