What reading level is the 21st Century Skills Library; Exploring Our Rainforests series?

The 21st Century Skills Library; Exploring Our Rainforests series by Tamra Orr is at a Grades 4.4–5.3 reading level (average Grade 4.8). Intended for Middle Grades (Ages 9–12). There are 5 books in the series.

What order should I read the 21st Century Skills Library; Exploring Our Rainforests books?

The 21st Century Skills Library; Exploring Our Rainforests series has 5 books in order: 1. Harpy eagle, 2. Hornbill, 3. Poison dart frog, 4. Red-eyed tree frog, 5. Reticulated python.

21st Century Skills Library; Exploring Our Rainforests Books in Order

5 books by Tamra Orr. Reading level: Grades 4.4–5.3. Middle Grades (Ages 9–12).

Series books grow with readers — but that's also the trap. Most series start at one reading level and one content intensity and drift upward over the course of the run. 21st Century Skills Library; Exploring Our Rainforests (5 books by Tamra Orr) lands at reading level Grades 4.4–5.3, with average content intensity 1/5. Intensity stays consistent across the series — a kid who can handle the first book can generally handle the rest.

The reading-order table below lists every book with per-volume reading level and intensity badges so you can spot any escalation before it catches your reader off guard. For a deeper dive into how we score text difficulty vs. emotional weight separately — and why series readers especially benefit from that split — see our methodology page.

Books

Grades 4.4–5.3

Reading Level

1/5

Avg. Intensity

Middle Grades

Content Intensity Across the Series

Consistent

Content stays at a steady intensity level throughout the series.

First book Latest book

21st Century Skills Library; Exploring Our Rainforests Reading Order

#	Title	Reading Level	Content
1	Harpy eagle Susan Heinrichs Gray	Level 4-5	Gentle
2	Hornbill Susan Heinrichs Gray	Level 4-5	Gentle
3	Poison dart frog Tamra Orr	Level 4-5	Gentle
4	Red-eyed tree frog Tamra Orr	Level 4-5	Gentle
5	Reticulated python Tamra Orr	Level 5-6	Gentle

Level 5-6

Questions about the 21st Century Skills Library; Exploring Our Rainforests series

What reading level is the 21st Century Skills Library; Exploring Our Rainforests series?: The 21st Century Skills Library; Exploring Our Rainforests series by Tamra Orr is at a Grades 4.4–5.3 reading level (average Grade 4.8). Intended for Middle Grades (Ages 9–12). There are 5 books in the series.
What order should I read the 21st Century Skills Library; Exploring Our Rainforests books?: The reading-order table above lists all 5 books with per-volume reading level and intensity ratings. Start with book 1 and read in publication order unless the table indicates a different recommended order for newer readers.
What age is the 21st Century Skills Library; Exploring Our Rainforests series appropriate for?: The 21st Century Skills Library; Exploring Our Rainforests series is recommended for Middle Grades (Ages 9–12). The average content intensity is 1/5. Check the intensity trajectory above to see whether content gets heavier across the series — if it does, sensitive readers may want to stop earlier in the run.