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Informational Text Complexity Measures


For the Birds: The Life of Roger Tory Peterson

For the Birds: The Life of Roger Tory Peterson

by Peggy Thomas and Laura Jacques

To help put the right book in each reader's hands, consider the following comprehensive text complexity analyses within your instructional plans.

Standards Model
of Text Complexity

Text Complexity Toolkit

Quantitative Measures

Lexile Level: 1010L   |    ATOS® Reading Level: 6.1   |    Word Count: 3,448

Grade Band Lexile® ATOS® Degrees of Reading Power® Flesch-Kincaid Fountas & Pinnell Reading Maturity SourceRater
2-3 420L-820L 2.75-5.14 42-54 1.98-5.34 I-P 3.53-613 0.05-2.48
4-5 740L-1010L 4.97-7.03 52-60 4.51-7.72 O-V 5.42-7.92 0.84-5.75
6-8 925L-1185L 7.00-9.98 57-67 6.51-10.34 U-Z 7.04-9.57 4.11-10.66
9-10 1050L-1335L 9.67-12.01 62-72 8.32-12.12 Z+ 8.41-10.81 9.02-13.93
11-12 1185L-1385L 11.20-14.10 67-74 10.34-14.20 Z+ 9.57-12.00 12.30-14.50
View all grade bands

Source: National Governors Association for Best Practices and Council of Chief State School Officers.[1]


Qualitative Measures


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Reader and Task Considerations

  • What do you want your students to accomplish with the text, and how will you implement this in your lesson?
  • How will you guide your students to construct meaning and grow as readers, based on the theme and content of this particular text?
  • Which readers will deeply connect with this text, and where does that fit into the instructional plan? Consider each specific reader's motivation, knowledge, and experiences, along with their age, learning needs, language, and reading skills.

Grades in which For the Birds: The Life of Roger Tory Peterson is Assigned


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1. National Governors Association for Best Practices and Council of Chief State School Officers. "Supplemental Information for Appendix A of the Common Core State Standards for English Language Arts and Literacy: New Research on Text Complexity," Common Core State Standards Initiative (2014): 4. Accessed August 8, 2014, http://www.corestandards.org/assets/E0813_Appendix_A_New_Research_on_Text_Complexity.pdf.

2. Adapted from the CCSSO's ELA State Collaborative on Assessment and Student Standards, and the text complexity rubrics used by the Wisconsin Department of Public Instruction ELA Team.

3. Lexile® is a trademark of MetaMetrics. Used under license.

4. ATOS® is a trademark of Renaissance Learning, Inc. Used under license.