Defenders of Wildlife

http://www.defenders.org/index.php

This is a worthy organization whose site I was connected to through care2. They're a long-established charity working to (get this) protect wildlife from extinction. Apart from donating and joining, the site is also useful for getting information on animals which are being protected. I took particular interest in the sections on wolves and manatees (which are some of my favorites), but there are many others being covered, including dolphins, buffalo, and mountain lions (among others). It's definitely a worthwhile cause, and one I might want to check back on.