National Geographic - The best and most established organization for interesting and new animal related articles.
National Wildlife Federation - This group helps sustain the nature of America for the benefit of people and wildlife. They often have interesting articles about a variety of species.
Yahoo! News - Regularly has fun and informative articles from the AP, Reuters, and other news organizations.
Fox News and MSNBC - They both have news-worthy wildlife stories on a regular basis.
The Huffington Post - Known for its political commentary and reporting, the Huffington Post has some of the best and most fascinating animal stories on the web.
Treehugger.com - It has great, informative stories about nature and other "green" topics.
Science Mag - It has a variety of science related material, including animals.
Science Daily - Although the site is a little cluttered, there's a ton of info on it if you can find it.
Google News - Probably the best way to pinpoint a specific article or type of story you're interested is by using google news. It searches the web the articles containing the keywords you're searching for.
Yahoo! Kids Animals - A great site for children to learn about animals.
