This is the Boat that Ben Built, written by Jen Lynn Bailey and illustrated by Maggie Zeng. pajama press, 2021. $22.95 ages 4 and up

"This is the LOON that floats by 
the BEAVER that builds by the 
FISH that swims in the river that 
carries THE BOAT that BEN 
BUILT."

What a fun way for readers to learn about a northern river ecosystem! 

Ben is the young explorer whose day is spent in a small wooden boat that he built himself. His companions (parent and dog) show great pride in his accomplishments. This boat, named Explorer, is packed and ready for whatever the day might bring. He first sees the fish that swim in the river that is floating his boat. His interested protectors for the trip follow along on the riverbank watching his progress. 

The boat continues to float, while Ben takes note of all nearby animals and action. A beaver building a dam attracts his attention; then a loon which requires careful observation through Ben's magnifying glass. Each new discovery is included in the cumulative text that follows his journey down the peaceful river. 

"This is the HERON all proper and prim
that lands on the MOOSE all wobbly and slim
that strolls by the BLACK BEAR taking a swim
that dives by the GOOSE with the gorgeous grin
that glides by the LOON that floats by the BEAVER 
that builds by the FISH that swims in the river
that carries THE BOAT that BEN BUILT." 

A hooting owl provides enough drama to reverse the direction the words have taken, bringing the story full circle. The lively text is just right for early readers with its repetitive language. Paired with Maggie Zeng's luminous digital art, it is sure to be read often and soon independently. Filled with movement and humor that adds to its appeal, it will encourage talk about the way an ecosystem works, food webs, and how many animals flourish in a healthy environment.  

Back matter includes an author's note about the what makes an ecosystem. She follows with related facts for each of the animals Ben meets along the way. Questions are posed to encourage critical thinking. Cumulative stories are not new; this one is the first I've seen about this particular ecosystem.