Which of these publishing brand mascots was created first?

The publishing industry has created some memorable brand mascots over the decades to help market books and build recognition. From children's literature to major publishing houses, these characters have become cultural touchpoints and powerful marketing tools. How well do you know the iconic mascots that have helped sell millions of books? Test your knowledge of these literary brand ambassadors!

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The Penguin (Penguin Books)
The Cat in the Hat (Random House's Dr. Seuss books)
Clifford the Big Red Dog (Scholastic)
The Hungry Caterpillar (World of Eric Carle)