Easily Identify the Living Things You Find on Intertidal Rocks! Enjoy learning to identify marine life on the rocky north Atlantic coast with this pocket-size field guide from author Cherie Hunter Day. With this handy, easy-to-use book, you'll be able to identify a wide variety of living things in no time. And its small size makes it just right for fitting into your pocket or pack when you go for a walk along the rocky coast.