Observation: Photinus pyralis
Primary Observer:
Katie Hietala-Henschell
Event Date:
2026-07-10
Status:
Unreviewed
Survey
Site Name:
Sleepy Hollow State Park
Province/State:
Michigan
Event Date:
2026-07-10
Time of Day:
Night-Time
Start Time:
20:48
End Time:
00:07
Number of Observers:
1
Primary Observer:
Katie Hietala-Henschell
Additional Observers:
NA
target_species_genus:
photinus
target_species_species:
aquilonius
Location and Habitat
Location Accuracy (meters):
0-25
Habitat Type:
Riparian - Areas Along lake or stream
Habitat Type Notes:
Survey occurred between Lake Ovid to the north and a smaller lake to the south. Lake edge had a narrow strip of cattails, grasses and sedges. Lake and wetland consisted of open water with duckweed. Standing snags were present south of the road and willow trees were common.
Elevation (meters):
240
Area Searched (hectares):
0.4
Artificial Light Sources
Vehicles: Yes
Street Lights: No
Buildings: No
Boats on Lake Ovid
Street Lights: No
Buildings: No
Boats on Lake Ovid
Artificial Light Types
Sky Glow (diffuse illumination in the sky): No
Light Trespass (light cast on surfaces beyond its intended target): No
Glare (bright light causing visual discomfort): Yes
Light Trespass (light cast on surfaces beyond its intended target): No
Glare (bright light causing visual discomfort): Yes
Artificial Light Notes:
E. Price Road relatively busy through midnight.
Observation
Observation Type:
With Flash Data
Number Observed:
50+
genus:
photinus
Species:
pyralis
Observation Notes:
16 mm. Hundreds flashing in woods, along road, and along lade edge. Still flashing strong at 9:50 PM.
Specimen Voucher Number:
Flash Behavior
First Flash Time:
20:48
Last Flash Time:
00:07
First Flash Temp (F):
73
Last Flash Temp (F):
65
Flashes in Pattern:
1
Flash Color:
Yellow
Flash Pattern Period:
5.75
Flash Duration:
0.75
Flash Interval:
5
Male Height Zone:
Low (0-3 ft), Moderate (3-8 ft)
Flash Location:
Hundreds flashing in woods, along road, and along lade edge. Still flashing strong at 9:50 PM.
Male Flash Behavior:
Characteristic J-shaped flash followed by 4-5 second dark interval. Slow flying.
