Eric Carle's The Very Hungry Caterpillar
Today Google’s logo has been replaced with a new logo inspired by Eric Carle’s The Very Hungry Caterpillar. The book which is 40 years old today still sells a copy every 30 seconds and is available in 47 languages worldwide. More information about the book can be found on Google Book Search.
You can find other alternative logos on Google’s holiday logos page.