The sources come first
A guide starts from published sources that know the subject: long-running bird counts kept by ornithology labs and their volunteers, government wildlife and agriculture agencies, and published research.
Backyard birds
Which feeder and which seed bring which birds, water in every season, keeping feeders clean, squirrels and other visitors, and telling one bird from another: plain answers to the questions backyard bird watchers keep running into, each one checked against ornithology labs, wildlife agencies and published research, and named so you can read them yourself.
Method
Every guide goes through the same five steps before it goes up.
A guide starts from published sources that know the subject: long-running bird counts kept by ornithology labs and their volunteers, government wildlife and agriculture agencies, and published research.
Each guide lists the sources it used, so you can read them yourself.
Every number in a guide comes from a named source, read when the guide is written, and the guide says when that was.
Where the sources disagree, on a seed, a feeder or a bird's range, the guide says so instead of quietly picking a side.
Tell us about a mistake and we fix the guide and note the change.