BirdLife International announced last week the launch of a new website encyclopedia of Spanish birds. The site is a huge database including bird fact sheets, 1600 photos and over 4000 individual pages.
The encyclopedia is at http://www.enciclopediadelasaves.es/ and you will need the latest version of Adobe Shockwave to view the site.
I had a look at the info page of one of my favorite birds, the Hoopoe. Each fact sheet includes distribution information, an audio file of the call and several photos. Similar birds can also be explored.
The database of birds can be viewed in several languages, including English.
Besides the bird fact sheets, there is a wealth of information on birding and bird life in general.