Microscopy UK
Microscopy Uk: A Virtual Pond Dip
In this site, you will be introduced to some of the more common organisms found in a pond. Contains a thorough guide to small and microscopic pond life with links to other descriptive sources.
Ohio State University
Ohio State University: Algae
An introduction to algae and how they fit into the protists. Written for the more advanced student and includes pictures and diagrams to enhance the understanding.
Woods Hole Oceanographic Institution
Woods Hole Oceanography Institute: Protists
View several pictures of protists while learning where they are found and what they consume.