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Observation: Unknown
Primary Observer:
Lauren
Event Date:
2025-07-14
Status:
Unverified
Survey
Site Name:
Humber River bike path
Province/State:
Ontario
Event Date:
2025-07-14
Time of Day:
Night-Time
Start Time:
09:40
End Time:
10:15
Number of Observers:
2
Primary Observer:
Lauren
Additional Observers:
Lauren, David
Target Species Genus:
unknown
Target Species Species:
unknown
Location and Habitat
Location Accuracy (meters):
100-250
Habitat Type:
Woodland/Forest - Trees dominant, and in the over-story
Habitat Type Notes:
Soft maple, black walnut, oak, grasses, euonymous, buckthorn, willow
Elevation (meters):
120-130
Area Searched (hectares):
0.317
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:
2-10
Genus:
unknown
Species:
unknown
Observation Notes:
Specimen Voucher Number:
Flash Behavior
First Flash Time:
09:40
Last Flash Time:
10:10
First Flash Temp (F):
26
Last Flash Temp (F):
28
Flashes in Pattern:
1
Flash Color:
Yellow
Flash Pattern Period:
12
Flash Duration:
0.5
Flash Interval:
4-5
Male Height Zone:
Moderate (3-8 ft), High (over 8 ft)
Flash Location:
Overhead in treeline, occasionally lower but not below eye level
Male Flash Behavior:
Female Flash Behavior:
1 thought on “Observation: Unknown”
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Thanks for submitting this firefly observation! Based on the later evening display time and the treetop display area, I think that Photuris is the most likely genus, but it is hard to confirm without a photo.
A note about flash pattern terminology:
“Flash pattern period” refers to the number of seconds between the start of a flash pattern and the start of the next repetition of that flash pattern. For example, Photinus pyralis typically has a flash pattern period of 5-7 seconds.
“Flash duration” is how long each flash lasts. Usually this is too fast to measure accurately, but you can estimate whether it is more or less than 0.5 seconds, you can enter “not recorded,” or you can do a verbal description (such as “very brief”).
“Flash interval” refers to the time between the end of one flash and the beginning of the next. In species with single flash patterns and short flash durations, this is basically the same as “flash pattern period,” just a little shorter.