Lang Elliott
This book and CD combo gives an excellent introduction to the sounds of frog species living in eastern and central North America. Anyone interested in frogs who spends a lot of time outdoors listening for them would appreciate this one - you'll be able to not only tell which frog you're hearing but what they are saying too! It starts out with all the species calls, and then theres a whole section on the CD with narrated explanations and examples of various types of calls, like advertisement calls (HEY, Baby!), aggressive calls, release calls, rain calls, distress calls, warning calls, mixed species choruses and so on.
Back when I got a copy, the CD didn't come with a full book like it does now - which appears to have some added information and pictures... just to make it that much more interesting.
Note: If you are on the west coast like me, this book will be lacking a bunch of species that are common here. So this is best used as a reference guide for those in the middle and eastern parts of the country.
