Pages 43, 44, 45, 85, 86, 87, 108, 109 © 1999, 2003, 2005, 2009 Michael Butkus
Pages 9, 10, 11, 12 (value scales) © 1997, 2003, 2006 Diane Cardacci
Page 216 © 2006 Sherm Cohen
Front cover (bear, pencil lines, squirrel, sheep, elk, cat, butterfly), 5, 11, 18-19, 24, 26-27, 30, 31-37, 42, 52-53, 65-67, 76, 77, 88-98, 106, 110, 111, 115, 120-124, 129-131, 134-135, 148-149, 156-159, 202 © 1989, 1990, 1997, 1998, 2003, 2009 Walter T. Foster
Pages 132-133, 136-145, 154, 155, 160-163 © 2010 Patricia Getha
Page 13 © 2004, 2005, 2009 Ken Goldman
Pages 218, 224-227, 232-239 © 2003, 2004, 2012 Debra Kauffman Yaun
Pages 210-213 © 1998, 2004 Jack Keely
Pages 198-201, 203-209, 214-215, 217 © 1999, 2004 Jack Keely and Carson van Osten
Front cover (center), spine, and pages 220-223, 228-231 © 2012, 2013 Cynthia Knox
Pages 128, 150-153 © 1989, 1998, 2003 Michelle Maltseff
Front cover (otter, elephant, toucan), 4, 15, 28-29, 40-41, 46, 50-51, 54, 56-64, 68-74, 164-165, 170-175 © 1989, 1997, 2001, 2003, 2004, 2005, 2006, 2009 William F. Powell
Page 10 © Carol Rosinski
Pages 47, 84, 102-105, 192-197 © 2007 Nolon Stacey
Front cover (rabbit), and pages 25, 55, 75, 78, 79, 80-83, 99-101, 112-114, 116-119, 125-127, 146-147 © 1989, 1998, 2003, 2005, 2009 Mia Tavonatti
Pages 1, 12, 14, 16, 17, 20-23, 38-39, 48-49, 166-169, 176-191 © 2008 Linda Weil