Abstract
"BirdBase" is a representative Web-GIS system, consisting of databases on the bird distribution and habitats in Hokkaido, Japan and Asia, has supplied information to anyone since 2004. The system was developed using ArcIMS of the available version in those days. Then, Maruyama and Ishizuka of the present authors prototyped another Web-GIS system using Google Maps API and relating technology to improve the display function for information of bird distribution and habitants. Institute of Environmental Sciences maintaining BirdBase lent data on the bird distribution in Hokkaido to us as sample data only for the system development in the limited period.
