Large-billed Tern
Large-billed TernLarge-billed TernLarge-billed TernLarge-billed Tern

Large-billed Tern

Phaetusa simplex

Least ConcernNear ThreatenedVulnerableEndangeredCritically Endangered
Insufficient data
overall probability at Iguazú National Park
1 Verified records at Iguazú National Park
☀️ Diurnal When it's active during daytime hours (6am–6pm)

The large-billed tern (Phaetusa simplex) is a species of tern in the family Laridae. It is placed the monotypic genus Phaetusa. It is found in most of South America (east of the Andes and north of the Pampas). It has occurred as a vagrant in Aruba, Bermuda, Cuba, Panama and the United States. Its natural habitats are rivers and freshwater lakes. Wikipedia →

Closest Relatives at Iguazú National Park

Black Skimmer
LC

Black Skimmer

☀️ Diurnal Bird

Rynchops niger

<5% · Rare
Southern Lapwing
LC

Southern Lapwing

☀️ Diurnal Bird

Vanellus chilensis

60–70% · Likely
Wattled Jacana
LC

Wattled Jacana

☀️ Diurnal Bird

Jacana jacana

<5% · Rare
Upland Sandpiper
LC

Upland Sandpiper

☀️ Diurnal Bird

Bartramia longicauda

Insufficient data
Spotted Sandpiper
LC

Spotted Sandpiper

☀️ Diurnal Bird

Actitis macularius

<5% · Rare
Black-necked Stilt
Endemic

Black-necked Stilt

☀️ Diurnal Bird

Himantopus mexicanus

<5% · Rare
Solitary Sandpiper
LC

Solitary Sandpiper

☀️ Diurnal Bird

Tringa solitaria

Insufficient data
Paraguayan Snipe
LC

Paraguayan Snipe

☀️ Diurnal Bird

Gallinago paraguaiae

Insufficient data
Lesser Yellowlegs
VU

Lesser Yellowlegs

☀️ Diurnal Bird

Tringa flavipes

Insufficient data

📅 Monthly Probability

📊

Fewer than 5 records of Large-billed Tern at Iguazú National Park — not enough to chart months honestly.

☀️ 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 Noel Kempff Mercado National Park 🇧🇴 Bolivia
50–60%
2 Parque Estadual Encontro das Águas 🇧🇷 Brazil
40–50%
3 Amacayacu National Natural Park 🇨🇴 Colombia
30–40%
4 Anavilhanas National Park 🇧🇷 Brazil
20–30%
5 Iberá National Park 🇦🇷 Argentina
20–30%
6 Tambopata National Reserve 🇵🇪 Peru
10–20%
7 Caroni Swamp 🇹🇹 Trinidad and Tobago
10–20%
8 Cuyabeno Wildlife Reserve 🇪🇨 Ecuador
5–10%
9 Manu National Park 🇵🇪 Peru
5–10%
10 El Palmar National Park 🇦🇷 Argentina
5–10%
11 Madidi National Park 🇧🇴 Bolivia
5–10%
12 Yasuní National Park 🇪🇨 Ecuador
5–10%
13 El Impenetrable National Park 🇦🇷 Argentina
5–10%
14 Sierra de la Macarena National Park 🇨🇴 Colombia
5–10%
15 Cordillera Azul National Park 🇵🇪 Peru
<5%
16 Amboró National Park 🇧🇴 Bolivia
<5%
17 Henri Pittier National Park 🇻🇪 Venezuela
<5%
18 Canaima National Park 🇻🇪 Venezuela
<5%
19 Tayrona National Natural Park 🇨🇴 Colombia
<5%
20 Machalilla National Park 🇪🇨 Ecuador
Insufficient data
21 Darién National Park 🇵🇦 Panama
Insufficient data
22 Iguaçu National Park 🇧🇷 Brazil
Insufficient data
23 Iguazú National Park 🇦🇷 Argentina
Insufficient data
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