What reading level is the Ecosystems (KidHaven) series?

Ecosystems (KidHaven) books are at a grades 5–8 reading level (average grade level 7.1), and HootRated recommends the series for ages 9–12. There are 5 books in the series.

What order should I read the Ecosystems (KidHaven) books?

Series numbers aren't available for most Ecosystems (KidHaven) books, so HootRated lists them by publication date: Ecosystems - Life in a Coral Reef (Ecosystems) (2003); Ecosystems - Life in a Pond (Ecosystems) (2003); Ecosystems - Life in a Rainforest (Ecosystems) (2003); Ecosystems - Life in the Arctic (Ecosystems) (2003); Ecosystems - Life in a Swamp (Ecosystems) (2005).

What age is the Ecosystems (KidHaven) series appropriate for?

HootRated recommends Ecosystems (KidHaven) for ages 9–12. Content is gentle (HootRated intensity 1/5). Intensity stays consistent across the series, so a reader who can handle the first book can generally handle the rest.

Ecosystems (KidHaven) Books in Order

Ecosystems (KidHaven) is a 5-book series by Hayley Haugen for ages 9–12, at a grades 5–8 reading level, with gentle content (HootRated intensity 1/5).

Books: 5; By publication date
Reading level: Grades 5–8; Average grade level 7.1
Recommended ages: Ages 9–12; From HootRated age ratings
Content intensity: Gentle; HootRated 1/5

Ecosystems (KidHaven) Reading Order

Series numbers aren't available for most Ecosystems (KidHaven) books, so they're listed by publication date (oldest first).

#	Title	Reading Level	Ages	Content
1	Ecosystems - Life in a Coral Reef (Ecosystems) 2003	Level 8-9	9-12	Gentle
2	Ecosystems - Life in a Pond (Ecosystems) 2003 · Stuart A. Kallen	Level 7-8	9-12	Gentle
3	Ecosystems - Life in a Rainforest (Ecosystems) 2003 · Stuart P. Levine	Level 6-7	9-12	Gentle
4	Ecosystems - Life in the Arctic (Ecosystems) 2003 · Tamra Orr	Level 5-6	9-12	Gentle
5	Ecosystems - Life in a Swamp (Ecosystems) 2005 · Karen D. Povey	Level 7-8	9-12	Gentle

Content Intensity Across the Series

Consistent

Content stays at a steady intensity level throughout the series.

First book Latest book

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. Ecosystems (KidHaven) (5 books by Hayley Haugen) lands at a grades 5–8 reading level, with average content intensity 1/5. Intensity stays consistent across the series, so a reader who can handle the first book can generally handle the rest.

The reading-order table above lists every book with per-volume reading level, age and intensity ratings 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.

All Ecosystems (KidHaven) Books

Ecosystems - Life in a Coral Reef (Ecosystems)

Hayley Haugen

Ecosystems - Life in a Coral Reef (Ecosystems)

Hayley Haugen

Level 8-9 Gentle

Ecosystems - Life in a Pond (Ecosystems)

Stuart A. Kallen

Ecosystems - Life in a Pond (Ecosystems)

Stuart A. Kallen

Level 7-8 Gentle

Ecosystems - Life in a Rainforest (Ecosystems)

Stuart P. Levine

Ecosystems - Life in a Rainforest (Ecosystems)

Stuart P. Levine

Level 6-7 Gentle

Ecosystems - Life in the Arctic (Ecosystems)

Tamra Orr

Ecosystems - Life in the Arctic (Ecosystems)

Tamra Orr

Level 5-6 Gentle

Ecosystems - Life in a Swamp (Ecosystems)

Karen D. Povey

Ecosystems - Life in a Swamp (Ecosystems)

Karen D. Povey

Level 7-8 Gentle

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Questions about the Ecosystems (KidHaven) series

What reading level is the Ecosystems (KidHaven) series?: Ecosystems (KidHaven) books are at a grades 5–8 reading level (average grade level 7.1), and HootRated recommends the series for ages 9–12. There are 5 books in the series.
What order should I read the Ecosystems (KidHaven) books?: Series numbers aren't available for most Ecosystems (KidHaven) books, so HootRated lists them by publication date: Ecosystems - Life in a Coral Reef (Ecosystems) (2003); Ecosystems - Life in a Pond (Ecosystems) (2003); Ecosystems - Life in a Rainforest (Ecosystems) (2003); Ecosystems - Life in the Arctic (Ecosystems) (2003); Ecosystems - Life in a Swamp (Ecosystems) (2005).
What age is the Ecosystems (KidHaven) series appropriate for?: HootRated recommends Ecosystems (KidHaven) for ages 9–12. Content is gentle (HootRated intensity 1/5). Intensity stays consistent across the series, so a reader who can handle the first book can generally handle the rest.