Let's make this birthday one to remember.

81 years old (Born on April 30, 1943)

Happy Birthday, Mercer Mayer! May your day be filled with fewer nightmares in closets and more friendly gorillas at parties. Your delightful Little Critter has taught generations that life's mishaps are best handled with humor—and perhaps a little mischief.

From the charming chaos of "There's a Nightmare in My Closet" to adventures alongside lovable monsters, you've sparked imaginations everywhere. Thanks for reminding us all that growing up is easier when accompanied by furry friends (real or imaginary). Here's wishing you another year full of creativity, laughter, and endless inspiration—because if anyone deserves their own pet gorilla today, it's definitely you!