UK Fisherman Portal
 

Please take the time to join the new "Fish Keeping Hobby" site below. The
site covers Marine Fish, Tropical Fish and Cold Water Fish, plus much more
like free downloads in PDF format.

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http://www.ukfisherman.com

You might also try
http://www.ScienceOxygen.com/biology.html
http://www.ScienceOxygen.com/animal.html
http://www.ScienceOxygen.com/botany.html
It is just with a collection of links on biology...