"Concepts are explained concisely and clearly, and a short glossary provides valuable vocabulary building. The slightly larger font makes the text inviting for emerging readers, and the illustrations blend perfectly into the story. Sassafras and the dragon prove to be able sidekicks in the vein of Disney characters...while this book is a natural fit for STEM collections, it deserves a place in all libraries serving young readers."

"...Citro gracefully balances her story’s scientific and fantasy elements."

"...the imaginative premise and the incorporation of STEM elements make this an attractive and engaging choice."

"...tales for young audiences that model the scientific method are nice to see."

"...a delightful beginning reader. I will definitely recommend this to kids and I look forward to the other books in this series."

"Zoey and Sassafras are our heroes! My kids love unravelling their mysterious circumstance, and they even made their own "thinking goggles." Zoey is an awesome role model."

"Citro takes the “girl helping animals” trope of beginning chapters to a whole new level. Filled with scientific language and experiments, including a helpful glossary, Zoey is encouraged to make mistakes, fail, and get up and keep trying. There’s no lack of child appeal either; both boys and girls will delight in the magical creatures and brisk storytelling and will be eager to try some of their own scientific experimentation, even if they can’t find a dragon!"