Jack efficiently covers the basics of field identification, and then goes into some of the intriguing side issues: molt, hybrids, and even intersex individuals. Steve then provides a carefully curated and annotated "photo salon" of plumages and seasonal variation likely to be encountered in Colorado (and elsewhere).
Enjoy!
Ted Floyd
Lafayette, Boulder County
[*]I mean, it's cool to try to identify birds even if they don't "count," whatever that means. But hey...