In Mosasaur, the reader learns what made this extinct reptile interesting and unique. This giant, slow moving snake-like reptile with double jointed jaws was as big as a semi-truck.

Bellwether Media’s Ancient Marine Life series is perfect for the young paleontologist who is ready to explore beyond dinosaurs. The informational text uses short sentences, supporting graphics, and bolded glossary terms to support developing readers. Size comparisons are made in relation to objects kids can visualize like a couch, a car, or a bus. Endpapers include glossary, index, print resources, and Factsurfer’s curated digital resources. The maps are one confusing feature. The maps on page 5 show the continent configuration during the period in which the animal lived without indicating how long ago it was nor explaining why the continents are different than they are currently. The location map at the end of the text does not indicate if it represents the location of fossil finds or presumed location of the extinct animal’s habitat. All in all, an attractive and engaging series.