Biotic Resources

• Biodiversity, by the Stanford Encyclopedia of Philosophy
  
• The biodiversity center
  
• IUCN red list of threatened species
  
• Endangered wildlife, by WWF
  
• Threats to global biodiversity
  
• Value of biodiversity, by the environmental development council
  
• Biodiversity, by the Union of Concerned Scientists
  
• On the destiny of species
  
• Encarta's page on endangered species
  
• Preserving unique areas - the biosphere reserves