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Observation: Unknown
Primary Observer:
Frank
Event Date:
2025-07-20
Status:
Unverified
Survey
Site Name:
My Home
Province/State:
Illinois
Event Date:
2025-07-20
Time of Day:
Night-Time
Start Time:
21:00
End Time:
21:10
Number of Observers:
2
Primary Observer:
Frank
Additional Observers:
Sara
Target Species Genus:
unknown
Target Species Species:
unknown
Location and Habitat
Location Accuracy (meters):
100-250
Habitat Type:
Developed - Sub/urban areas; parks/gardens
Habitat Type Notes:
Elevation (meters):
274 meters
Area Searched (hectares):
.105 hectares
Artificial Light Sources
Vehicles: No
Street Lights: No
Buildings: No
Street Lights: No
Buildings: No
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): No
Light Trespass (light cast on surfaces beyond its intended target): No
Glare (bright light causing visual discomfort): No
Artificial Light Notes:
Observation
Observation Type:
Flashing
Number Observed:
50+
Genus:
unknown
Species:
unknown
Observation Notes:
Specimen Voucher Number:
Flash Behavior
First Flash Time:
21:00
Last Flash Time:
21:10
First Flash Temp (F):
72
Last Flash Temp (F):
72
Flashes in Pattern:
2
Flash Color:
Yellow
Flash Pattern Period:
2
Flash Duration:
1
Flash Interval:
1
Male Height Zone:
Low (0-3 ft)
Flash Location:
Near the grass
Male Flash Behavior:
Female Flash Behavior:
1 thought on “Observation: Unknown”
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Thanks for submitting this firefly survey and observation! Based on the yellow flash color, location, and early evening display time, I think this is likely a Photinus firefly. Photinus pyralis would be the common, expected species in a suburban context like this, though Photinus marginellus is also found in the Chicago area. Both of these species actually have a single-pulse flash pattern, though. If you’re able to get photos, we may be able to get to a species ID!