Even with good guides, birds often are hard to identify because of age, sex, health, and individual differences as well as lighting conditions. I often like to get expert advice from knowledgeable birders so I post my picture to:https://forums.whatbird.com/index.php
This has helped me several times from wrongly labeling a bird picture. I am sure there are other similar sites out there; this is just one I have found helpful.
Cool app - thanks for sharing.
Cool app, but I have a half dozen large bird books (you will note I refrained from writing "big bird" books...….) so it usually isn't an issue.
This app is unbelievably good.