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I Used to Be a Fish facts for kids

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I Used to be a Fish
Hardcover of I Used to be a Fish.jpg
Hardcover of I Used to be a Fish
Author Tom Sullivan
Subject Evolution
Publisher HarperCollins Balzer + Bray
Publication date
October 11, 2016
Pages 48
ISBN 9780062451989

I Used to be a Fish is a book written by Tom Sullivan for ages 4–8. A boy imagines his pet fish tells him the story of evolution.


The 48-page book is drawn in 3 colors: red, blue and white. It was described as similar in style to Dr Seuss by some reviewers due to the simple drawing style and absurdity of the tale. It includes a timeline and author's note at the end for older children or parents who want material for further discussion.

About the author

Author-illustrator Tom Sullivan was a freelance graphic designer. This is the author's first book. The idea of the book came to him on a different project, “I was thinking about mammals and reptiles and eggs, when I got to frogs. I started to wonder how a frog who used to be a tadpole would describe that experience, and a title for a different story just popped into my head.”

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