Yellow-margined Flycatcher

Yellow-margined Flycatcher

Tolmomyias assimilis

Silhouette: Emily Willoughby · PhyloPic

Least ConcernNear ThreatenedVulnerableEndangeredCritically Endangered
Daily sighting probability <5% · Rare
at Brownsberg Nature Park
11 Verified sightings at Brownsberg Nature Park From 2019 to 2026
3,544 Verified sightings across all 32 parks From 2019 to 2026
January Best month highest sighting rate
☀️ Diurnal When it's spotted during daytime hours (6am–6pm)

About the Yellow-margined Flycatcher

The yellow-margined flatbill or Zimmer's flatbill (Tolmomyias assimilis) is a species of bird in the tyrant flycatcher family Tyrannidae. It is found in every mainland South American country except Argentina, Chile, Paraguay, and Uruguay.

The yellow-margined flatbill has a complicated taxonomic history. It was originally described as Rhynchocyclus assimilis. In the early twentieth century it was treated as a subspecies of the yellow-olive flatbill (now T. sulphurescens) but was separated by most authors starting in about 1940. As of 2025 it has eight subspecies. However, what is now the yellow-winged flatbill (T. flavotectus) was previously a ninth subspecies. It was separated starting in 2016 but the process continued until 2024. Confusingly, for a time T. flavotectus was called the yellow-margined flatbill.

The eight subspecies of the yellow-margined flatbill are: T. a. neglectus Zimmer, JT, 1939 T. a. examinatus (Chubb, C, 1920) T. a. obscuriceps Zimmer, JT, 1939 T. a. clarus Zimmer, JT, 1939 T. a. assimilis (Pelzeln, 1868)

T. a. sucunduri Whitney, Schunck, MA Rêgo & Silveira, 2013 T. a. paraensis Zimmer, JT, 1939 T. a. calamae Zimmer, JT, 1939 The... Wikipedia →

Closest Relatives at Brownsberg Nature Park

Gray-crowned Flycatcher
LC

Gray-crowned Flycatcher

☀️ Diurnal Bird

Tolmomyias poliocephalus

Daily sighting probability <5% · Rare
Rusty-margined Flycatcher
LC

Rusty-margined Flycatcher

☀️ Diurnal Bird

Myiozetetes cayanensis

Daily sighting probability ~40% · Likely
Slender-footed Tyrannulet
LC

Slender-footed Tyrannulet

☀️ Diurnal Bird

Zimmerius gracilipes

Daily sighting probability ~40% · Likely
McConnell's Flycatcher
LC

McConnell's Flycatcher

☀️ Diurnal Bird

Mionectes macconnelli

Daily sighting probability ~20% · Possible
Helmeted Pygmy-Tyrant
LC

Helmeted Pygmy-Tyrant

☀️ Diurnal Bird

Lophotriccus galeatus

Daily sighting probability ~20% · Possible
Yellow-crowned Tyrannulet
LC

Yellow-crowned Tyrannulet

☀️ Diurnal Bird

Tyrannulus elatus

Daily sighting probability ~20% · Possible
Forest Elaenia
LC

Forest Elaenia

☀️🌙 Day & Night Bird

Myiopagis gaimardii

Daily sighting probability ~20% · Possible
Southern Beardless-Tyrannulet
LC

Southern Beardless-Tyrannulet

☀️ Diurnal Bird

Camptostoma obsoletum

Daily sighting probability ~10% · With luck
Grayish Mourner
LC

Grayish Mourner

☀️🌙 Day & Night Bird

Rhytipterna simplex

Daily sighting probability ~10% · With luck
Dusky-capped Flycatcher
LC

Dusky-capped Flycatcher

☀️ Diurnal Bird

Myiarchus tuberculifer

Daily sighting probability ~10% · With luck
Short-tailed Pygmy-Tyrant
LC

Short-tailed Pygmy-Tyrant

☀️ Diurnal Bird

Myiornis ecaudatus

Daily sighting probability ~10% · With luck
White-lored Tyrannulet
LC

White-lored Tyrannulet

☀️ Diurnal Bird

Ornithion inerme

Daily sighting probability ~10% · With luck

Global Distribution

Warmer areas are where this animal is recorded most often.

Parks Where Found

# Park Country Daily sighting probability
1 Soberanía National Park 🇵🇦 Panama
~10%
2 Darién National Park 🇵🇦 Panama
~10%
3 Utría National Natural Park 🇨🇴 Colombia
~10%
4 Parque Natural Metropolitano 🇵🇦 Panama
~10%
5 San Lorenzo Protected Forest 🇵🇦 Panama
~10%
6 Tambopata National Reserve 🇵🇪 Peru
~10%
7 Anavilhanas National Park 🇧🇷 Brazil
~10%
8 Chagres National Park 🇵🇦 Panama
~10%
9 Yasuní National Park 🇪🇨 Ecuador
<5%
10 Gandoca-Manzanillo Wildlife Refuge 🇨🇷 Costa Rica
<5%
11 Brownsberg Nature Park 🇸🇷 Suriname
<5%
12 Cuyabeno Wildlife Reserve 🇪🇨 Ecuador
<5%
13 Sierra de la Macarena National Park 🇨🇴 Colombia
<5%
14 Canaima National Park 🇻🇪 Venezuela
<5%
15 Madidi National Park 🇧🇴 Bolivia
<5%
16 Bastimentos Island National Marine Park 🇵🇦 Panama
<5%
17 Amacayacu National Natural Park 🇨🇴 Colombia
<5%
18 Braulio Carrillo National Park 🇨🇷 Costa Rica
<5%
19 Manu National Park 🇵🇪 Peru
<5%
20 Tortuguero National Park 🇨🇷 Costa Rica
<5%
21 La Amistad International Park (Panama) 🇵🇦 Panama
<5%
22 Cordillera Azul National Park 🇵🇪 Peru
<5%
23 Podocarpus National Park 🇪🇨 Ecuador
<5%
24 Farallones de Cali National Natural Park 🇨🇴 Colombia
<5%
25 Arenal Volcano National Park 🇨🇷 Costa Rica
<5%
26 Tapantí-Macizo de la Muerte National Park 🇨🇷 Costa Rica
<5%
27 Machalilla National Park 🇪🇨 Ecuador
Insufficient data
28 Noel Kempff Mercado National Park 🇧🇴 Bolivia
Insufficient data
29 Cahuita National Park 🇨🇷 Costa Rica
Insufficient data
30 Amboró National Park 🇧🇴 Bolivia
Insufficient data
31 Tayrona National Natural Park 🇨🇴 Colombia
Insufficient data
32 Tenorio Volcano National Park 🇨🇷 Costa Rica
Insufficient data

Quick answers

What are the chances of seeing a Yellow-margined Flycatcher in Brownsberg Nature Park?

Under 5% of wildlife watchers report a Yellow-margined Flycatcher sighting in Brownsberg Nature Park, based on 11 verified sightings from GBIF citizen-science data.

When is the best time to see Yellow-margined Flycatcher in Brownsberg Nature Park?

January has the highest sighting rate for Yellow-margined Flycatcher in Brownsberg Nature Park in our monthly data.

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