Genus

Marsh Flies

Helophilus

7 species in our catalog · found in 17 parks

Species in this group

Helophilus trivittatus

Daily sighting probability ~20% · Possible

Helophilus fasciatus

Daily sighting probability ~20% · Possible

Helophilus pendulus

Daily sighting probability ~10% · With luck

Helophilus lapponicus

Daily sighting probability ~10% · With luck

Helophilus hybridus

Daily sighting probability ~10% · With luck

Helophilus hectori

Daily sighting probability ~10% · With luck

Endemic

Helophilus antipodus

Daily sighting probability ~10% · With luck

Daily sighting probability by month

Probability-weighted average across the group's species

<5%

Jan

<5%

Feb

<5%

Mar

<5%

Apr

~10%

May

~10%

Jun

~10%

Jul

~10%

Aug

~20%

Sep

~10%

Oct

<5%

Nov

<5%

Dec

When they're spotted

When the group's species are recorded (aggregated)

Where to see Marsh Flies

Warmer areas are where this group is recorded most often. Our parks Our cities

Parks Ranked

#	Park	Country	Species	Daily sighting probability
1	Wadden Sea National Park	🇩🇪 Germany	3 of 7	~30%
	Sun Fly			~10%
	Trivittate Marsh Fly			~10%
	Woolly-Tailed Marsh Fly			<5%
2	Kiskunság National Park	🇭🇺 Hungary	1 of 7	~20%
	Trivittate Marsh Fly			~20%
3	Isle Royale National Park	🇺🇸 United States	1 of 7	~20%
	Narrow-Headed Marsh Fly			~20%
4	Pacific Rim National Park Reserve	🇨🇦 Canada	2 of 7	~10%
	Yellow-Margined Marsh Fly			~10%
	Narrow-Headed Marsh Fly			~10%
5	Riding Mountain National Park	🇨🇦 Canada	2 of 7	~10%
	Narrow-Headed Marsh Fly			~10%
	Woolly-Tailed Marsh Fly			~10%
6	Point Pelee National Park	🇨🇦 Canada	1 of 7	~10%
	Narrow-Headed Marsh Fly			~10%
7	Bavarian Forest National Park	🇩🇪 Germany	2 of 7	~10%
	Trivittate Marsh Fly			~10%
	Sun Fly			~10%
8	Fiordland National Park	🇳🇿 New Zealand	2 of 7	~10%
	Helophilus hectori			~10%
	Helophilus antipodus			~10%
9	Snowdonia National Park	🇬🇧 United Kingdom	1 of 7	~10%
	Sun Fly			~10%
10	Białowieża National Park	🇵🇱 Poland	1 of 7	~10%
	Trivittate Marsh Fly			~10%
11	Fertő-Hanság National Park	🇭🇺 Hungary	1 of 7	~10%
	Trivittate Marsh Fly			~10%
12	Camargue	🇫🇷 France	1 of 7	~10%
	Trivittate Marsh Fly			~10%
13	Cairngorms National Park	🇬🇧 United Kingdom	1 of 7	~10%
	Sun Fly			~10%
14	Acadia National Park	🇺🇸 United States	1 of 7	~10%
	Narrow-Headed Marsh Fly			~10%
15	Shenandoah National Park	🇺🇸 United States	1 of 7	~10%
	Narrow-Headed Marsh Fly			~10%
16	Cévennes National Park	🇫🇷 France	1 of 7	<5%
	Sun Fly			<5%
17	Great Smoky Mountains National Park	🇺🇸 United States	1 of 7	<5%
	Narrow-Headed Marsh Fly			<5%

Cities Ranked

#	City	Country	Species	Daily sighting probability
1	Birmingham	🇬🇧 United Kingdom	2 of 7	~30%
	Sun Fly			~30%
	Woolly-Tailed Marsh Fly			<5%
2	Helsinki	🇫🇮 Finland	3 of 7	~30%
	Sun Fly			~20%
	Trivittate Marsh Fly			~10%
	Woolly-Tailed Marsh Fly			<5%
3	Warsaw	🇵🇱 Poland	3 of 7	~30%
	Sun Fly			~10%
	Trivittate Marsh Fly			~10%
	Woolly-Tailed Marsh Fly			~10%
4	Manchester	🇬🇧 United Kingdom	2 of 7	~30%
	Sun Fly			~20%
	Woolly-Tailed Marsh Fly			<5%
5	Liverpool	🇬🇧 United Kingdom	1 of 7	~30%
	Sun Fly			~30%
6	London	🇬🇧 United Kingdom	3 of 7	~20%
	Sun Fly			~20%
	Woolly-Tailed Marsh Fly			<5%
	Trivittate Marsh Fly			<5%
7	Amsterdam	🇳🇱 Netherlands	2 of 7	~20%
	Sun Fly			~20%
	Trivittate Marsh Fly			~10%
8	Copenhagen	🇩🇰 Denmark	2 of 7	~20%
	Sun Fly			~20%
	Trivittate Marsh Fly			~10%
9	Leeds	🇬🇧 United Kingdom	2 of 7	~20%
	Sun Fly			~20%
	Woolly-Tailed Marsh Fly			<5%
10	Hamburg	🇩🇪 Germany	2 of 7	~20%
	Sun Fly			~10%
	Trivittate Marsh Fly			~10%
11	Rotterdam [The Hague]	🇳🇱 Netherlands	2 of 7	~20%
	Sun Fly			~10%
	Trivittate Marsh Fly			~10%
12	Berlin	🇩🇪 Germany	3 of 7	~20%
	Sun Fly			~10%
	Trivittate Marsh Fly			~10%
	Woolly-Tailed Marsh Fly			<5%
13	Minneapolis [Saint Paul]	🇺🇸 United States	1 of 7	~20%
	Narrow-Headed Marsh Fly			~20%
14	Brussels	🇧🇪 Belgium	2 of 7	~10%
	Sun Fly			~10%
	Trivittate Marsh Fly			~10%
15	Paris	🇫🇷 France	2 of 7	~10%
	Sun Fly			~10%
	Trivittate Marsh Fly			<5%
16	Stockholm	🇸🇪 Sweden	1 of 7	~10%
	Sun Fly			~10%
17	Moscow	🇷🇺 Russia	3 of 7	~10%
	Sun Fly			~10%
	Woolly-Tailed Marsh Fly			<5%
	Trivittate Marsh Fly			<5%
18	Kyiv	🇺🇦 Ukraine	2 of 7	~10%
	Sun Fly			~10%
	Trivittate Marsh Fly			<5%
19	Yekaterinburg	🇷🇺 Russia	3 of 7	~10%
	Sun Fly			<5%
	Woolly-Tailed Marsh Fly			<5%
	Trivittate Marsh Fly			<5%
20	Dublin	🇮🇪 Ireland	1 of 7	~10%
	Sun Fly			~10%
21	Edmonton	🇨🇦 Canada	2 of 7	~10%
	Woolly-Tailed Marsh Fly			~10%
	Narrow-Headed Marsh Fly			<5%
22	Vienna	🇦🇹 Austria	2 of 7	~10%
	Sun Fly			~10%
	Trivittate Marsh Fly			<5%
23	Munich	🇩🇪 Germany	2 of 7	~10%
	Trivittate Marsh Fly			~10%
	Sun Fly			<5%
24	Anchorage	🇺🇸 United States	1 of 7	~10%
	Woolly-Tailed Marsh Fly			~10%
25	Essen	🇩🇪 Germany	1 of 7	~10%
	Sun Fly			~10%
26	Milan	🇮🇹 Italy	2 of 7	~10%
	Sun Fly			~10%
	Trivittate Marsh Fly			<5%
27	Boston	🇺🇸 United States	1 of 7	~10%
	Narrow-Headed Marsh Fly			~10%
28	Chicago	🇺🇸 United States	1 of 7	~10%
	Narrow-Headed Marsh Fly			~10%
29	Saint Petersburg	🇷🇺 Russia	2 of 7	~10%
	Sun Fly			~10%
	Trivittate Marsh Fly			<5%
30	Montreal	🇨🇦 Canada	1 of 7	~10%
	Narrow-Headed Marsh Fly			~10%
31	Prague	🇨🇿 Czechia	2 of 7	~10%
	Trivittate Marsh Fly			<5%
	Sun Fly			<5%
32	New York City	🇺🇸 United States	1 of 7	~10%
	Narrow-Headed Marsh Fly			~10%
33	Detroit	🇺🇸 United States	1 of 7	~10%
	Narrow-Headed Marsh Fly			~10%
34	Toronto	🇨🇦 Canada	1 of 7	~10%
	Narrow-Headed Marsh Fly			~10%
35	Washington	🇺🇸 United States	1 of 7	~10%
	Narrow-Headed Marsh Fly			~10%
36	Budapest	🇭🇺 Hungary	1 of 7	~10%
	Trivittate Marsh Fly			~10%
37	Novosibirsk	🇷🇺 Russia	1 of 7	~10%
	Sun Fly			~10%
38	Vancouver	🇨🇦 Canada	1 of 7	~10%
	Narrow-Headed Marsh Fly			~10%
39	Portland	🇺🇸 United States	1 of 7	<5%
	Narrow-Headed Marsh Fly			<5%
40	Bucharest	🇷🇴 Romania	1 of 7	<5%
	Trivittate Marsh Fly			<5%
41	Nizhny Novgorod	🇷🇺 Russia	1 of 7	<5%
	Sun Fly			<5%
42	Dallas	🇺🇸 United States	1 of 7	<5%
	Narrow-Headed Marsh Fly			<5%
43	Kazan	🇷🇺 Russia	1 of 7	<5%
	Sun Fly			<5%
44	Seattle	🇺🇸 United States	1 of 7	<5%
	Narrow-Headed Marsh Fly			<5%
45	Philadelphia	🇺🇸 United States	1 of 7	<5%
	Narrow-Headed Marsh Fly			<5%
46	Lyon	🇫🇷 France	1 of 7	<5%
	Sun Fly			<5%
47	Porto	🇵🇹 Portugal	1 of 7	<5%
	Sun Fly			<5%
48	Houston	🇺🇸 United States	1 of 7	<5%
	Narrow-Headed Marsh Fly			<5%
49	Sacramento	🇺🇸 United States	1 of 7	<5%
	Narrow-Headed Marsh Fly			<5%
50	Calgary	🇨🇦 Canada	1 of 7	<5%
	Woolly-Tailed Marsh Fly			<5%
51	Barcelona	🇪🇸 Spain	1 of 7	<5%
	Trivittate Marsh Fly			<5%
52	Austin	🇺🇸 United States	1 of 7	<5%
	Narrow-Headed Marsh Fly			<5%
53	Denver	🇺🇸 United States	1 of 7	<5%
	Narrow-Headed Marsh Fly			<5%
54	Salt Lake City	🇺🇸 United States	1 of 7	<5%
	Narrow-Headed Marsh Fly			<5%
55	Lisbon	🇵🇹 Portugal	1 of 7	<5%
	Trivittate Marsh Fly			<5%
56	San Antonio	🇺🇸 United States	1 of 7	<5%
	Narrow-Headed Marsh Fly			<5%
57	San Francisco	🇺🇸 United States	1 of 7	<5%
	Narrow-Headed Marsh Fly			<5%

Marsh Flies

Species in this group

Trivittate Marsh Fly

Narrow-Headed Marsh Fly

Sun Fly

Yellow-Margined Marsh Fly

Woolly-Tailed Marsh Fly

Helophilus hectori

Helophilus antipodus

Daily sighting probability by month

When they're spotted

Where to see Marsh Flies

Parks Ranked

Cities Ranked