A reasonable choice if you are looking for early readers about ocean animals.  The binding is sturdy.  The text is simple and direct. It’s got full-color photos and all the usual non-fiction text features.  It’s nature as an early reader puts some limits on the depth of information included, but it’s not completely wimpy in this regard.  One flaw I think young students would find confusing is on the pages where it is trying to show the lengths of the smallest and longest seahorses in comparison to other everyday objects:  the illustrations and the information don’t coincide — the smallest seahorse is described as .5 inches, in comparison to a penny, labeled as .75 inches, and yet the picture of the seahorse is bigger than the picture of the penny; the pictures of the smallest and largest seahorses (labeled as .5 inches and 12 inches, respectively, compared to a penny and a basketball respectively), are identical in size. Little kids will be confused by this.