Google doodles highlight our planet's 5 biomes to mark Earth Day.

Google launched a series of five doodles on Friday, featuring beautiful depictions of the planet's five biomes.

Artist Sophie Diao, one of Google's in-house "doodlers" created the series to mark the 46th annual Earth Day. 

"The vastness of Earth’s diversity makes it an intimidating topic, but in the end I chose to highlight Earth’s five major biomes: the tundra, forest, grasslands, desert, and coral reefs," Diao wrote in a blog post for Google. "In each illustration, you’ll find one animal who’s been singled out for their 15 minutes of fame." 

The doodles randomly swap out each time a user visits Google.

"I am personally in awe of nature’s persistence and creativity. Our planet – with its alternate scorching heat and bitter cold, its jagged peaks and deep trenches – may not always be kind to its inhabitants," Diao wrote. "Yet somehow the flora and fauna of Earth manage to thrive. On a day like this, we remember and celebrate our home in this great and stunning ecosystem."

Deserts

Grasslands

Oceans

Forests

Tundra