Great Dusky Swift
Great Dusky SwiftGreat Dusky SwiftGreat Dusky SwiftGreat Dusky Swift

Great Dusky Swift

Cypseloides senex

Least ConcernNear ThreatenedVulnerableEndangeredCritically Endangered
30–40% · Possible
overall probability at Iguazú National Park
1,569 Verified records at Iguazú National Park
October Best month highest sighting rate
☀️ Diurnal When it's active during daytime hours (6am–6pm)

The great dusky swift (Cypseloides senex) is a species of bird in subfamily Cypseloidinae of the swift family Apodidae. It is found in Argentina, Brazil, Paraguay, and possibly Bolivia. Wikipedia →

30–40% of wildlife watchers report a Great Dusky Swift sighting in Iguazú National Park, based on 1,569 days of visitor records from GBIF citizen-science data.

Closest Relatives at Iguazú National Park

Sooty Swift
LC

Sooty Swift

☀️ Diurnal Bird

Cypseloides fumigatus

<5% · Rare
Sick's Swift
LC

Sick's Swift

☀️ Diurnal Bird

Chaetura meridionalis

10–20% · With luck
🐦 No photo available
LC

Gray-rumped Swift

☀️ Diurnal Bird

Chaetura cinereiventris

10–20% · With luck
White-collared Swift
LC

White-collared Swift

☀️ Diurnal Bird

Streptoprocne zonaris

<5% · Rare
Biscutate Swift
LC

Biscutate Swift

☀️ Diurnal Bird

Streptoprocne biscutata

Insufficient data
Violet-capped Woodnymph
LC

Violet-capped Woodnymph

☀️ Diurnal Bird

Thalurania glaucopis

10–20% · With luck
Gilded Hummingbird
LC

Gilded Hummingbird

☀️ Diurnal Bird

Hylocharis chrysura

10–20% · With luck
Versicolored Emerald
LC

Versicolored Emerald

☀️ Diurnal Bird

Chrysuronia versicolor

5–10% · With luck
Scale-throated Hermit
LC

Scale-throated Hermit

☀️ Diurnal Bird

Phaethornis eurynome

5–10% · With luck
Glittering-bellied Emerald
LC

Glittering-bellied Emerald

☀️ Diurnal Bird

Chlorostilbon lucidus

5–10% · With luck
Planalto Hermit
LC

Planalto Hermit

☀️ Diurnal Bird

Phaethornis pretrei

5–10% · With luck
Sapphire-spangled Emerald
LC

Sapphire-spangled Emerald

☀️ Diurnal Bird

Chionomesa lactea

Insufficient data

📅 Monthly Probability

20–30
Jan
20–30
Feb
30–40
Mar
20–30
Apr
30–40
May
30–40
Jun
30–40
Jul
40–50
Aug
40–50
Sep
50–60
Oct
50–60
Nov
30–40
Dec

☀️ When They're Spotted

Most active during daytime hours (6am–6pm) · across all parks (global)

☀️Diurnal
☀️🌙🌙12am6am12pm6pm12am

Global Distribution

Where this species is recorded worldwide. Restricted to human observations from 2019 onwards — the same kind of record and the same period the probabilities on this page are built from, so collar-tracking studies, camera-trap arrays and museum specimens are excluded. Around Santa Rosa that removes 5,924 GPS fixes from a handful of tagged jaguars.

where this species is recorded (GBIF density — it tracks where observers go, not how likely a sighting is)  ·  parks where it occurs — tap a pin for the sighting probability there

Parks Where Found

# Park Country Probability
1 Iguaçu National Park 🇧🇷 Brazil
40–50%
2 Iguazú National Park 🇦🇷 Argentina
30–40%
3 Serra da Canastra National Park 🇧🇷 Brazil
20–30%
4 Chapada dos Guimarães National Park 🇧🇷 Brazil
<5%
5 Emas National Park 🇧🇷 Brazil
<5%
6 Parque Estadual Encontro das Águas 🇧🇷 Brazil
Insufficient data

Quick answers

What are the chances of seeing a Great Dusky Swift in Iguazú National Park?

About 37% of wildlife watchers report a Great Dusky Swift sighting in Iguazú National Park, based on 1,569 days of visitor records from GBIF citizen-science data.

When is the best time to see Great Dusky Swift in Iguazú National Park?

October has the highest sighting rate for Great Dusky Swift in Iguazú National Park in our monthly data.

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