LARKFEN FIELD GUIDE FRONT MATTER · THE METHOD & THE STANDARD

LARKFEN FIELD GUIDE PLATE M0 · METHODS & STANDARDS

Front matter · how the guide is built METHODS SECTION

The method, and the standard it is held to.

Every reference work opens by telling you how it was made. This is ours. A Larkfen plate moves through four passes — observe, measure, draw, verify — against named sources and a fixed set of measurement conventions, and nothing ships until it has been redlined for accuracy. What follows is the rulebook behind every number on the guide.

Passes per plate

Field marks verified

100%

Last redline

2026-06-14

REF · Ardea herodias · plate on Bay colorway

OBSERVE · MEASURE · DRAW · VERIFY · REDLINE

LARKFEN FIELD GUIDE PLATE M1 · HOW A PLATE IS MADE

§ Method · the pipeline

Four passes

From a record on the patch to a printed plate. The whole point of the brand lives in this sequence — designed, not generated. No pass is skipped, and the order does not change.

Pipeline
04 passes

PASS 01

Observe

It starts as a record on the patch — the bird logged, the diagnostic marks noted in the order you would actually call them in the field.

Logs: date · locality + datum · light · behaviour

PASS 02

Measure

Real measurement ranges — wing chord, total length, wingspan, mass — are pulled from primary references before a single line is drawn.

Conventions fixed · ranges, not means

PASS 03

Draw

The plate is built by hand around what separates the bird from its near-twins, then typeset as an instrument readout — the data set beside the form.

By hand · field marks first

PASS 04

Verify

Every claim is checked against a named source and redlined. Only then does the plate become a tee, a poster, or an edition.

Redlined · dated · accessioned

§§ The redline · corrections we made before shipping

A field guide lists its mistakes

The redline is the discipline that makes the rest credible. These are real corrections caught in Pass 04, kept on the record rather than quietly fixed — a field guide lists its mistakes as well as its sources.

Pass 04
04 corrections

Before · first draft

Goldfinch binomialCarduelis tristis

Downy WoodpeckerPicoides pubescens

Heron mass~5 kg (guess)

Molt termspostnuptial / prenuptial

After · redlined ☑

verified · AOSSpinus tristis

verified · AOSDryobates pubescens

BOW · sourced range1.82–3.6 kg

Pyle 2008prebasic / prealternate

OBSERVE · MEASURE · DRAW · VERIFY

LARKFEN FIELD GUIDE PLATE M2 · PARTS OF A BIRD

§ Topography — the parts we name

The topography of a bird

Before a number can mean anything, the parts have to be named. Every label below touches the feather it names on the reference figure — and the load-bearing distinction is drawn structurally: the primaries are the hand, the secondaries are the arm. These are the same terms used on every Larkfen plate.

Reference · right wing
Ardea herodias

FIG · SPREAD WING.viz-topo

REF · Ardea herodias · right wing, upper surface

§ Feather tracts · key to the figure
P1–P11PrimariesThe wingtip — rooted on the hand bones (manus); they set wing shape and wing chord.
S1–S10SecondariesThe inner wing — rooted on the arm (forearm / ulna).
InnerTertialsInnermost flight feathers, nearest the body.
RowGreater covertsOverlay the bases of the secondaries.
PatchLesser covertsThe marginal feathers along the leading edge.
ThumbAlulaThe "bastard wing" at the wrist.

DEFINE THE TERMS · LEGITIMIZE THE DATA · SEE THE GLOSSARY

LARKFEN FIELD GUIDE PLATE M3 · MEASUREMENT CONVENTIONS

§ The standard behind the numbers

How we state a measurement

A number means nothing without the convention that produced it. These are the rules every Larkfen data block follows — named, not invented — so a birder can trust what they read.

Conventions
fixed & cited

Wing chord
Folded-wing length, taken from the carpal (wrist) bend to the tip of the longest primary. Unless noted, Larkfen states the unflattened chord — the standard museum-skin measurement.Wing chord (biology) · Cornell BOW appendices
Total length
Bill tip to tail tip, specimen laid on its back. A whole-bird figure for comparison; it is not additive with wing chord.Standard skin convention
Wingspan
Tip to tip across both fully extended wings — a field/flight figure, distinct from wing chord.All About Birds
Mass
Stated as a range, never a single mean: body mass swings with season, sex, fat load and food. A range is the honest figure.Birds of the World
Culmen
The dorsal ridge of the upper mandible. We note exposed vs. total culmen where it matters, as the two differ.Bird topography
Sex & age
Where the sexes or ages overlap, we say so rather than print a false-precise figure. Overlap is data too.Redline policy

Sub-figure i. · Feather numbering

Numbering the flight feathers

Flight feathers are numbered to a fixed convention so two observers describe the same feather. Primaries run outward from the wrist, P1 (innermost) to P10 (outermost). Secondaries run inward from the wrist, S1 (outermost) toward the body. The diagram reads exactly that way.

Schematic right wing · trailing edgeprimaries flagged slate · ends marked

P10

← Body / innerwrist (carpal)Wing tip / outer →

Convention after Pyle (2008), Birding by Feather. The visible "fingers" of a soaring corvid are the outer primaries (P6–P10); the raven shows ~5, the crow ~4.

Sub-figure ii. · Range-map grammar

How to read a range key

Every Larkfen range key reads the same way, so a single glance decodes seasonality. Colour family carries the season — deep green for resident, warm sage for breeding, slate for non-breeding, khaki for passage — the same palette the study-page range maps use.

Residentpresent year-round on the patch
Breedingpresent in the nesting season only
Non-breedingwintering range only
On passagemigration corridor only

Patch datum
42.4534°N · 76.4735°W
Base map
Cornell BOW range maps
Fill rule
colour family = season · no-data hatched
Abundance
occurrence, not density

A NUMBER WITHOUT ITS CONVENTION IS DECORATION

LARKFEN FIELD GUIDE PLATE M4 · THE STANDARD

The Larkfen Standard

Designed, not generated.

Anything can put a bird on a shirt. The line we hold is accuracy and craft — the difference between a graphic and a study.

Correct binomial, every time

The scientific name is checked first and changed last. Spinus tristis, not the retired Carduelis; Dryobates, not Picoides. Binomials follow the current AOS check-list. If it is on a Larkfen piece, it is current.

Field marks you could call

We draw the diagnostic marks — the wedge tail, the throat hackles, the S-curved neck in flight — the details that separate a bird from its near-twins at real distance, not just at the feeder.

Real numbers, honestly set

Measurements and ranges come from sources, never invented for the layout. Where no clean figure exists — the raven's brain, a conflicted population estimate — we show a ranking or a qualitative note, not a fabricated number.

Redlined, dated, accountable

Every claim is verified against a named source and stamped with the date it was checked. The corrections we make are kept on the record, not hidden. Your own sighting is the only line we leave blank.

REDLINE ☑ · LAST VERIFIED 2026-06-14

SOURCES · CORNELL ALL ABOUT BIRDS · BIRDS OF THE WORLD · IUCN · AOS

LARKFEN FIELD GUIDE PLATE M5 · LITERATURE CITED

§ Bibliography · the authorities

What we cite, and for what

A field guide lists its authorities. These are the sources behind the numbers on every plate — checked, dated, and named so you can check them yourself.

Last accessed
2026-06-14

Source	What it backs	Last accessed
Cornell Lab — All About Birds	Field marks · ID · life history · sounds · wingspan	2026-06-14
Birds of the World	Measurements · molt · breeding biology · range maps (slug e.g. grbher3)	2026-06-14
IUCN Red List	Conservation status per species (Least Concern, all six)	2026-06-14
AOS / AOU Check-list	Current binomials · 4-letter alpha codes (GBHE · NOCA · CORA)	2026-06-14
Audubon Field Guide	Corroborating field marks & habitat notes	2026-06-14
Pyle (2008), Birding by Feather	Feather-numbering & molt convention (prebasic / prealternate)	2026-06-14
Bird topography & Wing chord (Wikipedia)	Glossary & measurement definitions, citing primary literature	2026-06-14

§§ Per-claim provenance · selected figures

Where the numbers trace back

A sample of how specific numbers trace back to a source, including the figures we deliberately keep qualitative because the sources disagree.

06 figures
3 flagged

Heron wing chord 430–490 mm	All About Birds / BOW
Heron mass 1.82–3.6 kg (corrected from a guess)	BOW · redlined
Heron wingspan 167–201 cm	All About Birds
Raven brain size — ranking only, no single EQ figure	flagged · sources conflict
Heron global population — stated qualitatively	flagged · PIF vs. IUCN differ
Cardinal & raven wing chord in mm — qualitative until pulled from BOW appendices	flagged · verify-before-print

LITERATURE CITED · ACCESSED 2026-06-14 · REDLINED

LARKFEN FIELD GUIDE PLATE M6 · FROM PLATE TO FIELD GOOD

§ The output · what the method produces

What a verified plate becomes

Once a plate clears Pass 04 it is issued as a field garment — the full study printed across the back, the accession label at the chest. The same numbers you just read, on the back of a shirt. Drag over either image to read it close; tap the inset to flip.

Field issue
back = the plate

FIELD ISSUE · TEELF-PATCH-001

BACK · FULL PLATE PRINT Great Blue Heron tee — full study plate printed across the back.

The Local Patch · LF-PATCH-001

Great Blue Heron

Ardea herodias

Plate 01, issued as a field garment after a full redline — every number on the back is the verified figure, not a guess. Comfort Colors 1717, garment-dyed, made to order.

Wing chord430–490 mm
Wingspan167–201 cm
Mass1.82–3.6 kg
StatusResident · LC
GarmentCC 1717 · Bay

$44Open the study →

Hover (or drag on mobile) over either image to zoom · tap the inset to flip

OBSERVE · MEASURE · DRAW · VERIFY · THEN IT SHIPS

INDEX SEE ALSO

§ Read on in the guide