Poecile rufescens
Silhouette: Andy Wilson · PhyloPic
In 3 days ~70% in a week ~90%
The chestnut-backed chickadee (Poecile rufescens) is a small passerine bird in the tit family, native to western North America. In the early 20th century, Joseph Grinnell hypothesized that the chestnut-backed chickadee diverged from the boreal chickadee (Poecile hudsonicus), because both species inhabited similar coniferous forest environments. Grinnell noted that the main differences between the boreal chickadee and the chestnut-backed were in the shade and tone of their respective brown coloration. He drew parallels between the varied chickadee characteristics using the fact that some bird species become smaller and more vibrantly brown as their habitat becomes more humid. Modern molecular phylogenetic studies have confirmed that the chestnut-backed chickadee is sister to the boreal chickadee since there were strong genetic similarities in mitochondrial DNA. More recent research regarding the population distribution of the chestnut-backed chickadee suggests that the genetic fragmentation of the chestnut-backed chickadee from the boreal chickadee was due to the changing glacial landscapes of the Pleistocene era. After this species divergence, the chestnut-backed chickadee... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Olympic National Park | 🇺🇸 United States | |
| 2 | Redwood National Park | 🇺🇸 United States | |
| 3 | Great Bear Rainforest | 🇨🇦 Canada | |
| 4 | Pacific Rim National Park Reserve | 🇨🇦 Canada | |
| 5 | Glacier National Park | 🇺🇸 United States | |
| 6 | Yosemite National Park | 🇺🇸 United States | |
| 7 | Kenai Fjords National Park | 🇺🇸 United States |
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | San Francisco | 🇺🇸 United States | |
| 2 | Seattle | 🇺🇸 United States | |
| 3 | Portland | 🇺🇸 United States | |
| 4 | Vancouver | 🇨🇦 Canada |
Possible
About 30% of wildlife watchers report a Chestnut-backed Chickadee sighting in Portland on a given day, based on 13,505 verified sightings from GBIF citizen-science data. It is the 21st most-seen of the 230 birds we can rate there. Over three days the chance rises to about 70%, and over a week to about 90%, if each day is a fresh chance.
December to October
In those months about 30% of wildlife watchers report a Chestnut-backed Chickadee in Portland on a given day, against about 20% in November, the lowest month.
Between 8 and 11 am
Across all the parks we cover, that three-hour window holds the most Chestnut-backed Chickadee sightings with a recorded time, and about 9 in 10 of them come between 6 am and 6 pm: it is a daytime animal.
3rd of 4
Of the 4 cities where we can rate Chestnut-backed Chickadee sightings, Portland ranks 3rd at about 30%. The best odds are in San Francisco (United States, about 50%) and Seattle (United States, about 50%).
GBIF citizen-science records
It is estimated from how often the Chestnut-backed Chickadee is recorded against all the birds logged in Portland (13,505 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.
