Identification of microscopic pond life with links to further information
Information on stream invertebrates
Lots of information and examples on ecological sampling techniques
From SAPS site, information on quadrats, random sampling etc.
Interactive exercise for mark release recapture.
Website and app which allow you to connect to a community of naturalists, very useful if you find an organism you cannot identify, take a photo on your phone, upload it, and someone knowledgeable will help you to identify it.