Which literary brand mascot was created by illustrator Theodor Geisel before he became famous as Dr. Seuss?

The publishing industry has created some of the most recognizable brand mascots in marketing history. These characters often transcend their commercial origins to become cultural icons in their own right. Test your knowledge about the famous mascots that have helped define major publishing houses, literary journals, and bookstore chains throughout the decades.

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The Penguin (Penguin Books)
The Faber Bird (Faber & Faber)
The Standard Oil Elephant (Esso/Exxon)
The New Yorker's Eustace Tilley