I received my copy of “The Warbler Guide” this week. I’ve only had a chance to skim through a few pages and species, but it appears to be a fairly comprehensive guide (note: not field guide) to warbler identification. It has several diagnostic photographs of each bird from different angles, including from below (which is a common enough view those of us with “warbler neck”). There are groups of photographs showing male and female plumages for adults and juveniles. It also has a series of sonogram-based song pictograms to help describe and differentiate songs within and among species.
I look forward to getting into the nuts and bolts on how this works, especially as we move through spring migration. I hope to have more comments on it then.
Here’s the website for the book:
http://www.thewarblerguide.com/
Lonely Birder 