Today on the Google home page is a video Google Doodle, aka logo, for the 100th anniversary of the US National Parks.

Here is the full video Doodle from Google:

Google wrote:

Here are the Doodle credits:

Story, direction, art, & animation: Sophie Diao
Patches & character design: Lydia Nichols
Additional animation support: Kevin Burke, Nate Swinehart, & David Davis
Music & sound design: Glen Matisoff
Special thanks to National Park Rangers Neal Herbert & Shelton Johnson for their guidance and inspiration!

Bing has a background of the Great Sand Dunes National Park:

Forum discussion at Google+.