Why bother with a nature journal?

A nature journal is not a school exercise. It is a working tool, and it will quietly change the way you look at a marsh, a canal or a gravel pit. When you know you will have to write something down, you start noticing the details you used to walk past: the way a snipe freezes against the mud, the exact shade of grey on a heron's back, the moment the wind swings round to the east and the surface of the water changes character.

Over a season, those notes build into something no field guide can give you — a personal record of one place. You will learn that the first chiffchaff usually arrives in your patch in the third week of March, that the teal numbers peak after the first hard frost, and that the reeds opposite the hide are always worth a second look in October.

Your kit and the first page

Keep it simple. A small notebook that actually fits a coat pocket will be used; a beautiful leather-bound volume left at home will not. A cheap A6 or A5 notebook with a waterproof cover is ideal, along with a pencil — ink runs in the drizzle that seems to accompany every good wetland session. Add a small ruler, a hand lens if you have one, and your phone for the occasional photograph or sound recording.

Start every entry with the same header. It takes thirty seconds and makes the notes far more useful later:

• Date and time, including start and finish.
• Location and, if you know it, a grid reference.
• Weather: temperature, cloud cover in eighths, rain or mist.
• Wind: direction and strength, from calm to the point where the reeds are bending flat.
• Water conditions: high or low, clear or coloured, any ice, any flood.

Leave a blank line between entries. You will want the space later.

Recording birds without a degree in ornithology

You do not need to identify everything. Write down what you are confident about, then describe the rest. A rough count is far better than a vague "lots" — around 40 teal, 6 shoveler, 1 grey heron tells you something in February that "loads of ducks" never will.

For each bird, note three things: what it was doing, where it was, and how it looked. Behaviour is often the giveaway. A water rail skulking at the edge of the reeds, a kingfisher perched low over open water, a marsh harrier quartering slowly above the reedbed — each of these is a sentence worth writing.

• Plumage: adult or juvenile, male or female, moulting or in fresh feather.
• Jizz: the overall impression of shape, posture and movement before you see any colour.
• Sound: describe calls in your own words. "A sharp, repeated chip" is more useful than nothing at all.
• Distance: was it 20 metres away or 200? This affects every identification you make.

If you are unsure between two species, write both and note the features that confuse you. That page will be the one you return to, and next time the answer will be obvious.

Weather, water and the wider picture

Wetland wildlife responds to weather faster than almost anything else in the British countryside. Water levels after a week of rain push dabbling ducks onto flooded grassland; a hard frost concentrates them on the few remaining open patches; a strong south-westerly keeps everything hunkered down in the lee of the reeds. Note it all.

Look beyond birds, too. Otter spraint on a stone beneath a bridge, the burrows of water voles in a bank, banded demoiselles along a sunny ride in July, the first yellow flag iris opening in May — these entries add texture and tell you when to expect things next year. Frogs spawning, dragonflies emerging, the smell of the mud in late summer: all fair game for a journal.

Sketches, maps and quick marks

Nobody is judging your drawing. A sketch is simply a way of recording shape and proportion that words cannot manage. A three-centimetre scribble of a wader's head and bill, with arrows showing how it fed, will jog your memory a year later far better than a paragraph.

Draw a rough map of your site as well. Mark the hide, the main pool, the muddy margins, the reedbed edge, the footpath. Then plot your sightings onto copies of it through the year. Patterns emerge quickly: the corner where snipe always feed, the bush where the cetti's warbler sings, the stretch of bank the otters use.

Making it a habit

Ten minutes is enough. Aim to write up your notes the same day, while the sound of the wind and the smell of the water are still fresh. Once a month, read back through and pick out anything interesting — a species you have not recorded before, a count that seems unusually high, a date that feels early or late.

Your records are genuinely valuable. County bird recorders and local wildlife trusts rely on observations from ordinary people, and a well-dated notebook is exactly the kind of evidence they need. More than that, though, the journal becomes a companion. After a few years you will not just know your local wetland; you will know how it breathes through the seasons, and you will notice at once when something changes.