The doodle appears on the home page of Google. It begins with the Rufous Hummingbird bird flapping its wings and delivering nectar inside the flowers.

The next slides may throw up anyone of the five other species depicted in the doodle in a random manner. Just by hovering the mouse over the doodle, every creature wishes ‘Happy Earth Day’.

Google has also placed a share button just below the doodle. When a user clicks on it, Google shares the doodle on Twitter, Facebook or Google+.

Started in 1970, Earth Day is celebrated in more than 192 countries each year to demonstrate support for environmental protection.

The idea was the brainchild Gaylord Nelson, then a US Senator from Wisconsin. Nelson conceived the idea after witnessing the 1969 massive oil spill in Santa Barbara, California.

Inspired by the student movement that was going on at the time against the Vietnam war, Nelson dreamt of movement that would make people think about air and water pollution and force environmental protection onto the national political agenda.