http://www.ucmp.berkeley.edu/exhibits/biomes/deserts.php
http://www.ucmp.berkeley.edu/glossary/gloss5/biome/aquatic.html
http://www.ucmp.berkeley.edu/exhibits/biomes/grasslands.php
http://www.ucmp.berkeley.edu/exhibits/biomes/forests.php
http://www.ucmp.berkeley.edu/glossary/gloss5/biome/tundra.html
http://www.ucmp.berkeley.edu/glossary/gloss5/biome/aquatic.html
http://www.ucmp.berkeley.edu/exhibits/biomes/grasslands.php
http://www.ucmp.berkeley.edu/exhibits/biomes/forests.php
http://www.ucmp.berkeley.edu/glossary/gloss5/biome/tundra.html