The Kerlan Award presented by the University of Minnesota

Inducted into the Society of Illustrators Hall of Fame

Horse Song: The Naadam of Mongolia: ALA Notable, 2009 Bank Street College Best Books of the Year.

Heat Wave: Kirkus starred; SLJ starred

Cowgirl Kate and Cocoa: Theodor Suess Geisel Honor Citation, 2006

Duck For President: NYT 10 Best Illustrated Books: 2005, BookSense Honor, SLJ Starred, Kirkus pointer, NYT #1 Best Seller; NYT 10 Best Illustrated picture books 2004; 33 weeks on the list as of Nov. 21, 2004, New York Public Library Best Books, American Book Sellers Best Books, Parents Magazine Best Books, School Library Journal Best Books, Bank Street Best Books, New York Magazine Top 5 Election Year Children's Books

Honorees, Childrens' Division, Brooklyn Public Library, 2002

Giggle, Giggle, Quack: NYT Best Seller, Starred Review, Publishers Weekly

Dumpy La Rue: NYT 10 Best Illustrated Books, 2001

Click, Clack, Moo; Cows That Type: Caldecott Honor 2000; PW starred; SLJ starred; PW Best Seller; NYT Best Seller; Silver Medal, Society of Illustrators Original Art 2000; ALA Notable; PW Best Books 2000; SLJ Best Books Los Angeles Times Best Books; Bank Street Best Books; Cuffie Award; Simington Black Honor; BookSense Honor, The Bill Martin Jr. Award, Kansas Reading Assoc.,'03, The Charlotte Award, NYSRA '02, The Maryland Black-eyed Susan Award, '02, The Smart Award, '02

Araminta's Paintbox: ABS Pick of the List ‘90

Ho, Ho, Ho: ABS Pick of the List ‘93

Somebody Catch My Homework: Kirkus pointer; Childrens Choices

Mattie's Little Possum Pet: Kirkus pointer

Yo, Hungry Wolf: Childrens Choices

Booby Hatch: SLJ starred; SLJ Best Books of the Year ‘95

A Thousand Cousins: Childrens Choices

No Such Thing: SLJ Honor Book ’97; Bulletin for Center on Childrens Books Blue Ribbon; Nebraska Golden Sower Award

Snake Ally Band: Child Magazine Best Books ’98; SLJ starred; Bank Street College Best Books ‘98

Aunt Minnie McGrannahan: Kirkus pointer; PW starred

Gorilla Walk: SLJ starred; Smithsonian Notable Books ’99, NSTA CB Outstanding Science Trade Book 2000; NY Public Library Childrens Books ’99 100 Titles for Reading and Sharing; ALA Notable ’99,

Elephant Quest: NSTA CBC Outstanding Science Trade Book 2001; John Burroughs Award for Outstanding Nature Book for Young Readers

Central Park Children's Zoo: The Big Crit for Excellence in Design ‘98 Critique Magazine

Pratt Institute Alumni Achievement Award 2000

Is It Far To Zanzibar?: Parents Choice Gold Award 2000; Starred Bank Street College Best Books 2001

Purrfectly Purrfect: NY Public Library Childrens Book List

Promises: Bank Street College Best Books 2001