Green Hands USA: America Volunteers

Nearly 200 of the world's most endangered species of birds have a new ally: Rovio Entertainment Ltd, the company behind the popular Angry Birds games.

The new Angry Birds website encourages the game's fans to play the latest version of Angry Birds for the Chrome web browser online and in the process to get angry about bird extinctions. Players can make donations which conservation organization BirdLife International will put to good use protecting the 189 bird species around the world that are classified as critically endangered.

Players can also use the site to find out more about these endangered species, specifically 10 of BirdLife's most important Preventing Extinctions projects. They can also connect to BirdLife through Facebook to keep up to date on how these projects are going.

"This is a very exciting opportunity for BirdLife," BirdLife International's Preventing Extinctions Program Manager Jim Lawrence said in a prepared statement. "We are thrilled to be Angry Birds' charity of choice and we look forward to seeing how this exciting campaign develops and our future relationship evolves."

To learn more about the critically endangered Philippine eagle, northern bald ibis, Fiji petrel or spoon-billed sandpiper -- or just to play a game of Angry Birds -- visit http://birdlife.angrybirds.com/.