I recently read about an interesting experiment conducted by bloggers around the world to measure the biodiversity in the areas where they live: http://scienceblogs.com/voltagegate/2007/03/announcing_the_first_annual_bl.php Here is a very interesting blog, detailing the experience of one group who participated in this. Sounds like a great exercise for children to become involved in: http://ntsavanna.wordpress.com/
