This field guide to North American birds, written by the foremost birding writers, delivers a power-punch of innovation and usability never before brought to together in one reference. With 730 new color maps based on the latest range information (more than any other previous field guide), this title emphasizes on bird behaviour and a 'whole bird' philosophy of field identification. It contains informative essays on each bird group giving vital information regarding behaviour and id tips and robust introduction to birds and birding precedes the species accounts with sections on species I.D., conservation, bird morphometrics, topography, and migration.Vocalisations on the accompanying CD are clearly organised in separate tracks for each species - this is a fantastic advantage that no other collection like this has ever provided. In the past, CD recordings ran species vocalizations together in one long track. The DVD format allows for hundreds of separate tracks - users can listen to a particular vocalization easily and quickly. This is key for learning to I.D. birds by song and for use in the field.