8: Extinction is Forever Last updated Save as PDF Page ID 26707 John W. Wilson & Richard B. Primack Open Book Publishers 8.0: Prelude to Extinction is Forever 8.1: What is Extinction? 8.2: Rates of Extinction 8.3: When is a Species Extinct? 8.4: History of Extinctions in Sub-Saharan Africa 8.5: Which Species are at Risk of Extinction? 8.6: Characteristics of Threatened Species 8.7: Problems of Small Populations 8.8: Is De-extinction a Solution? 8.9: Summary 8.10: Topics for Discussion 8.11: Suggested Readings 8.12: Bibliography