Behaviour & Habitat
Everything on this page is provisional. It describes what witnesses repeatedly say, which is not the same thing as what an animal repeatedly does, and the distinction is worth holding onto while you read.
Where reports come from
Reports cluster on edges. Not woodland and not town, but the seam between them: drainage easements, wooded parking lots, rail corridors, creek beds, abandoned foundations, back property lines, utility access roads. Almost nothing in the archive happens in open ground, and the few cases that do are among our weakest.
The obvious objection is that edges are also where people walk their dogs at night, and we have no good answer to it.
When
Peak reporting falls between roughly 11:40 P.M. and 4:30 A.M. Whether that is the animal's schedule, the witness's schedule, or simply the hours in which a shape becomes hard to resolve, we cannot separate.
Objects
The archive is disproportionately full of missing gloves. Also plastic ornaments, hose fittings, wind chimes, hand tools, and single shoes — very often single shoes. The items have almost no value and are almost never damaged. Several are later recovered nearby, usually closer to water than where they started.
We have no explanation and have resisted several offered to us.
Patterns that recur often enough to name
Watching before anything else. The commonest description in the archive is of something motionless at the edge of cover, facing the witness. Movement towards it usually ends the encounter.
Boundary use. Fence lines, culverts, retaining walls, creek banks, service alleys. Far more than open ground.
Route repetition. At repeat sites the activity tends to follow one narrow path for several nights and then stop, often after somebody installs a light or cuts back vegetation, and always after somebody chases it.
Interest in unattended things. Tools, coolers, porch items, open bags. This exceeds what we would expect by chance. It is not tool use and we would ask members to stop writing it up as though it were.
Ham. Processed pork appears often enough in the historical files that the safety literature names it specifically. That is a prohibition, not a baiting recommendation, and the number of members who have needed this explained to them is not small.
Answering. Witnesses who imitate the three-note whistle sometimes report a second sequence from somewhere else. This is not approved practice, for reasons set out in Circular 12-C.
Repeat sites
What tends to mark one: the same sound from the same boundary on separate nights; small objects moved without anything being stolen; a motion camera triggering repeatedly and catching nothing usable; short-lived impressions near a drainage edge. Any one of those is nothing. Three of them at one address is a file.
Weather
Archived Mid-Atlantic reports rise modestly after warm rain, particularly where culverts and creek margins are open. We have never established whether wet ground raises activity, preserves traces that would otherwise vanish, or simply gets people looking at the mud.
On the late-summer rise
August and early September are historically heavy in eastern Pennsylvania and northwestern New Jersey. Juvenile dispersal, insect abundance, vegetation density and the simple fact that people are outdoors after dark in August all compete as explanations, and we are not in a position to choose between them.
Terminology
The patterns above are defined by what they look like, not by what anything is doing. Council usage of boundary hold, route repeat, object drift and pattern set is in the Field Glossary.
Reviewed 11/2023 by the Eastern Pennsylvania chapter. Sections 3 and 4 predate the 2019 style revision and read like it.