2 books · Ages 4–8 · Chapter Books
Amazing Ocean Creatures is a 2-book series for ages 4–8 by Elaine M. Alexander. Each book stands alone — start anywhere.
Start anywhere — each book stands alone.
That said, Anglerfish: The Seadevil of the Deep and Giant Cuttlefish: Chameleon of the Sea are great first picks.
No particular order needed — browse and pick what catches your eye.