A Gopher in the Garden and Other Animal Poems (1967)
(illustrated by Robert Leydenfrost)

The Terrible Tiger (1970)
(illustrated by Arnold Lobel)

Toucans Two and Other Poems (1970)
(illustrated by José Aruego)

Circus (1974)
(illustrated by Arnold Lobel)

Nightmares: Poems to Trouble Your Sleep (1976)
(illustrated by Arnold Lobel)

It’s Halloween (1977)
(illustrated by Marylin Hafner)

The Mean Old Mean Hyena (1978)
(illustrated by Arnold Lobel)

The Queen of Eene (1978)
(illustrated by Victoria Chess)

The Headless Horseman Rides Tonight: More Poems to Trouble Your Sleep
(1980) (illustrated by Arnold Lobel)

Rolling Harvey Down the Hill (1980)
(illustrated by Victoria Chess)

It’s Christmas (1981)
(illustrated by Marylin Hafner)

The Sheriff of Rottenshot (1982)
(illustrated by Victoria Chess)

Kermit’s Garden of Verses (1982)
(illustrated by Bruce McNally)

The Baby Uggs are Hatching (1982)
(illustrated by James Stevenson)

It’s Thanksgiving (1982)
(illustrated by Marylin Hafner)

Zoo Doings: Animal Poems (1983)
(illustrated by Paul O. Zelinsky)

It’s Valentine’s Day (1983)
(illustrated by Yossi Abolafia)

The Random House Book of Poetry for Children (1983)
(illustrated by Arnold Lobel)

It’s Snowing! It’s Snowing! (1984)
(illustrated by Jeanne Titherington)

The New Kid on the Block (1984)
(illustrated by James Stevenson)

Ride a Purple Pelican (1984)
(illustrated by Garth Williams)

My Parents Think I’m Sleeping (1985)
(illustrated by Yossi Abolafia)

Read Aloud-Rhymes for the Very Young (1986)
(illustrated by Marc Brown)

Tyrannosaurus Was a Beast: Dinosaur Poems (1988)
(illustrated by Arnold Lobel)

Beneath a Blue Umbrella (1990)
(illustrated by Garth Williams)

Something BIG Has Been Here (1990)
(illustrated by James Stevenson)

For Laughing Out Loud: Poems to Tickle Your Funnybone (1991)
(illustrated by Marjorie Priceman)

There’ll Be a Slight Delay: And Other Poems for Grown-ups (1991)
(illustrated by Jack Ziegler)

A. Nonny Mouse Writes Again! (1993)
(illustrated by Marjorie Priceman)

The Dragons Are Singing Tonight (1993)
(illustrated by Peter Sís)

Monday’s Troll (1996)
(illustrated by Peter Sís)

A Pizza the Size of the Sun (1996)
(illustrated by James Stevenson)

The Beauty of the Beast: Poems from the Animal Kingdom (1997)
(illustrated by Meilo So)

Hooray for Diffendoofer Day! (1998)
(with Dr. Seuss; illustrated by Lane Smith)

Dog Days: Rhymes around the Year (1999)
(illustrated by Dyanna Wolcott)

The Gargoyle on the Roof (1999)
(illustrated by Peter Sís)

The 20th Century Children’s Poetry Treasury (1999)
(illustrated by Meilo So)

It’s Raining Pigs and Noodles (2000)
(illustrated by James Stevenson)

Awful Ogre’s Awful Day (2001)
(illustrated by Paul O. Zelinsky)

The Frogs Wore Red Suspenders (2002)
(illustrated by Petra Mathers)

Scranimals (2002)
(illustrated by Peter Sís)

If Not for the Cat (2004)
(illustrated by Ted Rand)

Wild Witches’ Ball (2004)
(illustrated by Kelly Ashbury)

Behold the Bold Umbrellaphant and Other Poems (2006)
(illustrated by Carin Berger)

I’m Glad I’m Me: Poems About You (2006)

What a Day It Was at School! (2006)
(illustrated by Doug Cushman)

Good Sports: Rhymes about Running, Jumping, Throwing, and More (2007)
(illustrated by Chris Raschka)

In Aunt Giraffe’s Green Garden (2007)
(illustrated by Petra Mathers)

Me I Am! (2007)
(illustrated by Christine Davenier)

The Wizard (2007)
(illustrated by Brandon Dorman)

Awful Ogre Running Wild (2008)
(illustrated by Paul O. Zelinsky)

My Dog May Be a Genius (2008)
(illustrated by James Stevenson)

Be Glad Your Nose Is on Your Face and Other Poems (2008)
(illustrated by Brandon Dorman)

Pizza, Pigs, and Poetry: How to Write a Poem (2008)

The Swamps of Sleethe: Stories from Beyond the Solar System (2009)
(illustrated by Jimmy Pickering)

The Carnival of the Animals (2010)
(illustrated by Mary GrandPré)

I’ve Lost My Hippopotamus (2012)
(illustrated by Jackie Urbanovic)