Translated from the Chinese published in 2015.

Includes bibliographical references (pages 166-169).

"The sea-with its unknowable depths, its far-reaching horizons, and its sparkling surface-holds some in fascination, others in fear. But one thing can't be denied by either beholder of the water: it is home to an array of species we can't even begin to know the extent of. But as for the underwater creatures of the past, who have been extinct for millions of years, we can make an attempt at learning all of them. With The Secrets of Ancient Sea Monsters, you can explore the depths of waters you never knew of, and the aquatic reptiles that ruled that murky world below sea-level. These creatures couldn't be matched, and they are waiting for you to discover all there is to know about their lives!" -- Back Cover.

Ages 10-12.