Birding & Nature Tools
Tools for birders and backyard naturalists — the binocular specification that actually matters, the nest box hole size that decides which species moves in, a nectar recipe with the things that harm hummingbirds named plainly, and lists worth keeping over years.
Exit pupil, twilight factor and field of view explained — including why a 7×50 is not brighter than a 7×35 for most people over forty.
Hummingbird Nectar Ratio CalculatorThe 4:1 recipe scaled to any batch, how often to change it by temperature, and the four things that must never go in the feeder.
Nest Box & Bird Feeder GuideNest box hole sizes by species — the dimension that decides who moves in — plus which seed attracts what and what to avoid.
Bird Song Mnemonic TrainerSixteen songs as the phrases birders actually use to remember them, with a quiz mode — the fastest route into learning birds by ear.
Life List & Year List TrackerLog sightings and keep a life list, a year list and a record of where and when — stored in your browser with nothing uploaded.
Nature Journal & Phenology TrackerRecord first bloom, first swallow and first frost year after year, compared by day-of-year rather than by date — stored in your browser.
About these birding & nature tools
Experienced birders identify most birds without ever getting a good look at the colour, and the reason is that colour is the least reliable thing about a bird. It changes with light, with feather wear, with age, with season and often with sex, and a bird seen against a bright sky is a silhouette regardless of what it is wearing. Shape, posture, proportion and the way it moves stay constant — how it holds its tail, whether it hops or walks, whether it flies straight or in bounds, how long the bill looks relative to the head. Birders call this impression jizz, and it is why someone can name a bird at a distance where no field mark is visible while a beginner with better binoculars cannot. It is also why field guides frustrate beginners: they are organised taxonomically, which is the least useful order for someone who does not already know roughly what they are looking at. The second thing worth knowing is that time and place do more identification work than any field mark. Most species are somewhere for only part of the year, and knowing what is plausible in your county this week eliminates the great majority of the guide before you start. The third is that windows kill an enormous number of birds — estimates for the United States run to hundreds of millions a year — and the fix is cheap and unglamorous. Markings on the OUTSIDE of the glass, spaced no more than a couple of inches apart, work; a single silhouette sticker does almost nothing, because birds fly through the gaps.