In honor of Earth Day on Tuesday, Google has a special, animated doodle on its homepage, which shows you a different animal species each time you click on it. Some of the animals featured are the Japanese macaque, rufous hummingbird, moon jellyfish and the veiled chameleon. You can also share it on Facebook, Twitter and Google+. Earth Day is celebrated in more than 190 countries, during which people around the world show their support for the protection of the environment. First celebrated in 1970, it is now coordinated by the Earth Day Network. Google has celebrated Earth Day with a different Doodle each year since 2001. You can find them all here.