Bucephala clangula
Silhouette: Andy Wilson · PhyloPic
In 3 days ~30% in a week ~50%
The common goldeneye or simply goldeneye (Bucephala clangula) is a medium-sized sea duck of the genus Bucephala, the goldeneyes. Its closest relative is the similar Barrow's goldeneye. The genus name is derived from the Ancient Greek boukephalos ("bullheaded", from bous, "bull" and kephale, "head"), a reference to the bulbous head shape of the bufflehead. The species name is derived from the Latin clangere ("to resound").
Common goldeneyes are aggressive and territorial ducks, and have elaborate courtship displays. The common goldeneye was formally described in 1758 by the Swedish naturalist Carl Linnaeus in the tenth edition of his Systema Naturae under the binomial name Anas clangula. Linnaeus specified the type location as Europe but in 1761 restricted this to Sweden. The common goldeneye is now one of three species placed in the genus Bucephala that was introduced in 1858 by the American naturalist Spencer Baird. The genus name is from Ancient Greek boukephalos meaning "bullheaded" or "large-headed". The specific epithet is from Latin clangere meaning "to resound".
Two subspecies are recognised: Wikipedia →
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Calgary | 🇨🇦 Canada | |
| 2 | Helsinki | 🇫🇮 Finland | |
| 3 | Lanzhou | 🇨🇳 China | |
| 4 | Edmonton | 🇨🇦 Canada | |
| 5 | Anchorage | 🇺🇸 United States | |
| 6 | Stockholm | 🇸🇪 Sweden | |
| 7 | Nizhny Novgorod | 🇷🇺 Russia | |
| 8 | Denver | 🇺🇸 United States | |
| 9 | Sacramento | 🇺🇸 United States | |
| 10 | Liverpool | 🇬🇧 United Kingdom |
With luck
About 10% of wildlife watchers report a Common Goldeneye sighting in San Francisco on a given day, based on 9,928 verified sightings from GBIF citizen-science data. It is the 85th most-seen of the 375 birds we can rate there. Over three days the chance rises to about 30%, and over a week to about 50%, if each day is a fresh chance.
January
In that month about 30% of wildlife watchers report a Common Goldeneye in San Francisco on a given day, against under 5% in April to October, the lowest months. That is one of San Francisco's wettest months, with about 90 mm of rain against almost none in July.
Between 11 am and 2 pm
Across all the parks we cover, that three-hour window holds the most Common Goldeneye sightings with a recorded time, and about 9 in 10 of them come between 6 am and 6 pm: it is a daytime animal.
19th of 67
Of the 67 cities where we can rate Common Goldeneye sightings, San Francisco ranks 19th at about 10%. The best odds are in Calgary (Canada, about 50%), Helsinki (Finland, about 40%) and Lanzhou (China, about 40%).
GBIF citizen-science records
It is estimated from how often the Common Goldeneye is recorded against all the birds logged in San Francisco (9,928 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.
