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All ten datasets describe the same object: a name, a stretch of the year, and sometimes a peak inside it. What differs is what the bar is allowed to mean.

Shape	What a bar means	Peak tick	Used by
Migration	a passage — arriving, present, leaving	yes, two of them	birds, bats, butterflies, moths, dragonflies
Bloom	one window, ramping to a best fortnight	yes	flowers, mushrooms, u-pick
Season	flat — on, or off, with no middle	no	game laws, farmers markets

The season shape exists because some things do not ramp. A deer season is shut on 25 September and open on 26 September, and is exactly as open on 7 February as it was in November; a farmers market is exactly as open on its last Saturday as its first. A triangle would be telling a reader something false about a statute in one case and about opening hours in the other, and in both the reader could act on it.

Nine guilds that peak nine weeks apart, so they get nine seats rather than one.

• Ohio Bird Migration — all 67 rows on one chart
• Ohio Waterfowl Migration — waterfowl, 9 rows
• Ohio Crane Migration — cranes, 1 row
• Ohio Raptor Migration — raptors and vultures, 6 rows
• Ohio Shorebird Migration — shorebirds, 8 rows
• Ohio Swallow and Swift Migration — aerial insectivores, 7 rows
• Ohio Thrush Migration — thrushes, 5 rows
• Ohio Warbler Migration — warblers, 15 rows
• Ohio Vireo and Oriole Migration — vireos, tanagers, orioles, flycatchers, 9 rows
• Ohio Sparrow and Finch Migration — sparrows, kinglets and winter finches, 7 rows

One chart each. These are the groups whose members move together closely enough that splitting them would be resolution nobody asked for.

• Ohio Bat Migration — all 8 rows on one chart
• Ohio Butterfly and Moth Migration — all 8 rows on one chart
• Ohio Moth Migration — all 9 rows on one chart
• Ohio Dragonfly Migration — all 7 rows on one chart

• Ohio Flower Bloom Times — all 54 rows on one chart
• Ohio Woodland Wildflower Bloom — spring woodland, 16 rows
• Ohio Tree and Shrub Bloom — trees and shrubs, 14 rows
• Ohio Prairie Flower Bloom — prairie and meadow, 14 rows
• Ohio Goldenrod and Aster Bloom — late summer and autumn, 10 rows

• Ohio Wild Mushroom Seasons — all 35 rows on one chart

The only chart on this site with a group that peaks in December. Oyster mushrooms and velvet shank fruit in the January thaws, in the fortnight everything else here is dark.

Thirty-eight pages, one per species, and the only place on the site where a tracker page is a single animal rather than a group. That is not a taxonomy argument: squirrel opens on 1 September and beaver on 26 December, and a "furbearers" bar would be averaging a law, which is not a thing that can be averaged.

These are calendars and not licences. Nothing on them replaces the regulations booklet, the zone maps, the bag limits or the permit rules.

Deer and turkey (2)

White-tailed Deer · Wild Turkey

Small game (8)

American Crow · Chukar · Eastern Cottontail · Fox Squirrel · Gray Squirrel · Northern Bobwhite · Red Squirrel · Ring-necked Pheasant

Furbearers (10)

American Beaver · American Mink · Gray Fox · Long-tailed Weasel · Muskrat · Raccoon · Red Fox · River Otter · Striped Skunk · Virginia Opossum

Waterfowl and migratory birds (14)

American Black Duck · American Coot · American Woodcock · Blue-winged Teal · Canada Goose · Common Gallinule · Green-winged Teal · Mallard · Mourning Dove · Snow Goose · Sora · Virginia Rail · Wilson's Snipe · Wood Duck

Frogs and turtles — taken on a fishing licence (4)

American Bullfrog · Green Frog · Snapping Turtle · Softshell Turtle

The two newest trackers, and the first that are not about wild Ohio.

• Columbus Farmers Market Seasons — all 25 rows on one chart
• Central Ohio U-Pick Seasons — all 31 rows on one chart

Each has a companion page carrying the map and the addresses rather than the calendar: Columbus Farmers Markets and Central Ohio U-Pick Farms.

Fifty-six of these sixty pages sit behind a mark on the passage strip under the breadcrumb trail — the row of small gauges that light as their subject comes into season. Press a mark and it lands on its page.

Four pages have no mark. Two are whole-taxon overviews whose guilds already hold the seats (Ohio Bird Migration and Ohio Flower Bloom Times). The other two are the food trackers, and that is deliberate: the strip is an instrument about wild Ohio, and a farmers market is not wild. They are loaded by the server so their charts render, and they take no seat.

Four steps, in this order, and none of them is optional:

1. Write data/migration/<id>.mjs — the dataset, its mode, its guilds, its words, and a header comment naming the source every date came from.
2. Add the id to TAXA in scripts/build-migration.mjs and run it. It writes the chart SVGs and the JSON bundle into public/migration/.
3. Add the id to the loader list in main.js, or the marker will render "No migration data".
4. Put <!-- migration: <id> --> on the page above the H1 — headings here are collapsible and hidden until hover, so a chart under one is a chart nobody sees.

Give it a seat on the passage strip only if it belongs there. That is a separate edit in main.js, and PASSAGE_TRACKER_PAGES is a contract with the page's path — rename a page that holds a mark and the link dies silently, rendering as a live link to a 404.

• Calendar — the dated half of the same idea
• Seasons · Lunar Calendar
• Nature — where fifty-eight of these pages live
• Leisure — the front of the vault