| Caves (13)  
  
  
  Biospeleology   - Illinois Natural History Survey web site. Within caves a diverse biota may be found, exhibiting varying degrees of adaptation to the subterranean environment. Information and links about cave habitats and fauna, as well as cave protection and related top - http://www.inhs.uiuc.edu/~sjtaylor/cave/biospeleol.html        
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