Empidonax virescens
Silhouette: Emily Willoughby · PhyloPic
In 3 days <5% in a week ~10%
The Acadian flycatcher (Empidonax virescens) is a small insect-eating bird of the tyrant flycatcher family. Adults have olive upperparts, darker on the wings and tail, with whitish underparts; they have a white eye ring, white wing bars and a wide bill. The breast is washed with olive. The upper part of the bill is dark; the lower part is yellowish. This bird's song is an explosive peet-sa. The call is a soft peet. They also have a call similar to that of the northern flicker. A unique two-note song described as "ka-zeep" helps to identify this species.
Measurements: Length: 5.5–5.9 inches (14–15 cm) Weight: 0.4–0.5 ounces (11–14 g) Wingspan: 8.7–9.1 inches (22–23 cm) Originally described in 1810 by ornithologist Alexander Wilson, its first scientific name was Muscicapa querula. The Acadian flycatcher is the only member of its clade within Empidonax, but is most closely related to willow and alder flycatchers.
Because of the similar appearance of the Empidonax flycatchers, the Acadian flycatcher owes its name to a misidentified type specimen for the species, taken in the historic Acadia region of Nova Scotia. Despite its common name, the Acadian flycatcher... Wikipedia →
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Medellín | 🇨🇴 Colombia | |
| 2 | Washington | 🇺🇸 United States | |
| 3 | Cali | 🇨🇴 Colombia | |
| 4 | Baltimore | 🇺🇸 United States | |
| 5 | Orlando | 🇺🇸 United States | |
| 6 | Houston | 🇺🇸 United States | |
| 7 | Bogota | 🇨🇴 Colombia | |
| 8 | Philadelphia | 🇺🇸 United States | |
| 9 | San José | 🇨🇷 Costa Rica | |
| 10 | Panama City | 🇵🇦 Panama |
Rare
Under 5% of wildlife watchers report an Acadian Flycatcher sighting in Chirripó National Park on a given day, based on 15 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 262nd most-seen of the 332 birds we can rate there. Over three days the chance rises to under 5%, and over a week to about 10%, if each day is a fresh chance.
September
In that month about 10% of wildlife watchers report an Acadian Flycatcher in Chirripó National Park on a given day, against under 5% in October to August, the lowest months. That is one of Chirripó National Park's wettest months, with about 550 mm of rain against 75 mm in February.
Between 9 am and noon
Across all the parks we cover, that three-hour window holds the most Acadian Flycatcher sightings with a recorded time, and about 9 in 10 of them come between 6 am and 6 pm: it is a daytime animal.
27th of 38
Of the 38 parks where we can rate Acadian Flycatcher sightings, Chirripó National Park ranks 27th at under 5%. The best odds are in Congaree National Park (United States, about 30%), Darién National Park (Panama, about 20%) and Shenandoah National Park (United States, about 20%).
Same genus: Empidonax
The closest relatives of the Acadian Flycatcher that you can see in Chirripó National Park (genus Empidonax, Empidonax Flycatchers) are Yellow-bellied Flycatcher (about 10%) and Yellowish Flycatcher (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Acadian Flycatcher is recorded against all the birds logged in Chirripó National Park (15 verified sightings from 2019 to 2026), calibrated against known sighting rates. Figures are rounded to the nearest 10% because citizen-science data supports honest approximations, not decimals, and months with records from fewer than five people show "—". How it works.
