Mo Willems and Dr. Seuss

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Across
  1. 1. Cat Z has this under his hat
  2. 4. Elephant friend in Mo Willems' books
  3. 6. Pink spot on dad's $10 pair of _
  4. 8. This feline in a hat comes back
  5. 10. _ eggs and Ham
Down
  1. 2. Horton hears this official calling to him from the clover
  2. 3. Name of the small pig in Mo Willems' series
  3. 5. Dr. Seuss character who speaks for the trees
  4. 7. Who hears a Who
  5. 9. Mo Willems' bus-driving bird