Home/Reference
Reference charts
Tables built from the published nest box, feeding and optics figures, with sources named on each chart.
Most popular pick
- Birdhouse dimensions chart by speciesEntrance hole diameter, floor size, depth, hole height and mounting height for 29 North American cavity and ledge nesters, from the published nest box tables.
- Nest box entrance hole sizes, smallest to largestEvery common birdhouse entrance size from 1 inch to 6 inches, which species each admits, and which invasive species a given hole keeps out.
- Bird seed types chartSixteen kinds of bird seed and food, which birds each attracts, which feeder it needs, whether squirrels want it, and how it stores. Black oil sunflower to nectar.
- What backyard birds eat: species by foodTwenty-seven common backyard birds, their preferred foods in order, the feeder types they use, and whether they feed on the ground or at hanging feeders.
- Bird feeder types by speciesSeventeen bird feeder types, what seed each holds, which birds use it, which birds cannot, how squirrel-resistant it is and how hard it is to clean.
- How often to change hummingbird nectar, by temperatureThe temperature chart for changing hummingbird feeder nectar: every 6 days below 75 F, down to every day above 92 F, plus the 1:4 recipe and batch sizes.
- Bird feeder placement distancesEvery distance that matters when placing a bird feeder: window collision zone, squirrel jump range, baffle height, cover distance, feeder height and spacing between feeders.
- Binocular specs chart for birdingExit pupil, twilight factor and relative brightness for twelve common binocular configurations from 6x30 to 12x50, with what each one suits for bird watching.
Popular picks
Prices move constantly; the button shows the current figure.
Researched guidance, not professional advice. Prices and availability change often; the buttons show the current listing. Figures come from published tables and manufacturer specifications, not hands-on trials.