Aegolius funereus
Silhouette: Ferran Sayol · PhyloPic
In 3 days <5%
The boreal owl or Tengmalm's owl (Aegolius funereus) is a small owl in the "true owl" family Strigidae. It is known as the boreal owl or, more rarely, Richardson's owl after Sir John Richardson, in North America, and as Tengmalm's owl in Europe and Asia, after the Swedish naturalist Peter Gustaf Tengmalm.
Due to its nocturnal habits and preferred inaccessible taiga forest habitat, it is rarely seen by humans; when met with, it is often extremely confident, showing little or no fear of people, only flying off if approached to within 3–5 metres.
The boreal owl was formally described by the Swedish naturalist Carl Linnaeus in 1758 in the tenth edition of his Systema Naturae. Linnaeus placed it with all the other owls in the genus Strix and coined the binomial name Strix funerea.
Currently, seven subspecies are accepted, though there is no genetic basis for more than two subspecies, one (A. f. funereus, Tengmalm's owl) in the Old World, and one... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Triglav National Park | 🇸🇮 Slovenia | |
| 2 | Pyrénées National Park | 🇫🇷 France | |
| 3 | Rocky Mountain National Park | 🇺🇸 United States | |
| 4 | Yellowstone National Park | 🇺🇸 United States |
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Novosibirsk | 🇷🇺 Russia | |
| 2 | Moscow | 🇷🇺 Russia | |
| 3 | Helsinki | 🇫🇮 Finland | |
| 4 | Calgary | 🇨🇦 Canada |
| # | Zoo / Centre | Country | |
|---|---|---|---|
| 1 | Lusen National Park Centre | 🇩🇪 Germany | |
| 2 | Карельский зоопарк | 🇷🇺 Russia | |
| 3 | Birds of prey | 🇨🇦 Canada | |
| 4 | Asahiyama Zoo | 🇯🇵 Japan | |
| 5 | Tierpark Hexentanzplatz | 🇩🇪 Germany | |
| 6 | Zoologischer Garten Halle | 🇩🇪 Germany | |
| 7 | Zoopark Limpopo | 🇷🇺 Russia | |
| 8 | Small Breeds Farm Park | 🇬🇧 United Kingdom | |
| 9 | Chouette à voir! | 🇨🇦 Canada | |
| 10 | Karelian Zoo | 🇷🇺 Russia |
Rare
Under 5% of wildlife watchers report a Boreal Owl sighting in Calgary on a given day, based on 11 verified sightings from GBIF citizen-science data. It is the 258th most-seen of the 259 birds we can rate there. Over three days the chance rises to under 5%, if each day is a fresh chance.
Any time of year
In every month with enough records, under 5% of wildlife watchers report a Boreal Owl in Calgary on a given day, so our monthly data shows no clear season.
Between 7 and 10 pm
Across all the parks we cover, that three-hour window holds the most Boreal Owl sightings with a recorded time, and about half of them come between 6 am and 6 pm: it is seen both by day and at night.
4th of 4
Of the 4 cities where we can rate Boreal Owl sightings, Calgary ranks 4th at under 5%. The best odds are in Novosibirsk (Russia, about 10%), Moscow (Russia, under 5%) and Helsinki (Finland, under 5%).
GBIF citizen-science records
It is estimated from how often the Boreal Owl is recorded against all the birds logged in Calgary (11 verified sightings), 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.
