Mareca strepera
Silhouette: Andy Wilson · PhyloPic
In 3 days ~10% in a week ~30%
The gadwall (Mareca strepera) is a common and widespread dabbling duck in the family Anatidae. The gadwall was first described by Carl Linnaeus in his landmark 1758 10th edition of Systema Naturae. DNA studies have shown that it is a sister species with the falcated duck; the two are closely related to the three species of wigeons, and all of them have been assigned to the genus Mareca. There are two subspecies:
Mareca strepera strepera (formerly Anas strepera strepera), the common gadwall, described by Linnaeus, is the nominate subspecies. The specific name strepera is Late Latin for "noisy". The etymology of the word gadwall is not known, but the name has been in use since 1666.
The gadwall is 47–58 cm (19–23 in) long with a 78–85 cm (31–33 in) wingspan. The male is slightly larger than the female, weighing on average 990 g (35 oz) against her 850 g (30 oz). The breeding male is patterned grey, with a black rear end, light chestnut wings, and a brilliant white speculum, obvious in flight or at rest. In non... Wikipedia →
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Anchorage | 🇺🇸 United States | |
| 2 | London | 🇬🇧 United Kingdom | |
| 3 | Rotterdam [The Hague] | 🇳🇱 Netherlands | |
| 4 | Denver | 🇺🇸 United States | |
| 5 | Seattle | 🇺🇸 United States | |
| 6 | Helsinki | 🇫🇮 Finland | |
| 7 | Portland | 🇺🇸 United States | |
| 8 | Amsterdam | 🇳🇱 Netherlands | |
| 9 | Manchester | 🇬🇧 United Kingdom | |
| 10 | Birmingham | 🇬🇧 United Kingdom |
| # | Zoo / Centre | Country | |
|---|---|---|---|
| 1 | Parque y Zoológico Nacional Arquitecto Manuel Valverde Podestá | 🇩🇴 Dominican Republic | |
| 2 | Yerevan Zoo | 🇦🇲 Armenia | |
| 3 | Saint Louis Zoo | 🇺🇸 United States | |
| 4 | Berlin Zoological Garden | 🇩🇪 Germany | |
| 5 | Oregon Zoo | 🇺🇸 United States | |
| 6 | Inokashira Park Zoo | 🇯🇵 Japan | |
| 7 | L'Oceanogràfic | 🇪🇸 Spain | |
| 8 | Zoo Koki (Parque zoológico y botánico) | 🇪🇸 Spain | |
| 9 | Aquarium Berlin | 🇩🇪 Germany | |
| 10 | Zooparque Itatiba | 🇧🇷 Brazil |
Rare
Under 5% of wildlife watchers report a Gadwall sighting in Ranchi on a given day, based on 6 verified sightings from GBIF citizen-science data. It is the 66th most-seen of the 76 birds we can rate there. Over three days the chance rises to about 10%, and over a week to about 30%, if each day is a fresh chance.
January–February and October–November
In those months about 10% of wildlife watchers report a Gadwall in Ranchi on a given day, against under 5% in March–September and December, the lowest months. Those are among Ranchi's driest months, with about 30 mm of rain a month against 350 mm in July.
Between 9 am and noon
Across all the parks we cover, that three-hour window holds the most Gadwall sightings with a recorded time, and about 8 in 10 of them come between 6 am and 6 pm: it is a daytime animal.
59th of 120
Of the 120 cities where we can rate Gadwall sightings, Ranchi ranks 59th at under 5%. The best odds are in Anchorage (United States, about 50%), London (United Kingdom, about 30%) and Rotterdam [The Hague] (Netherlands, about 30%).
GBIF citizen-science records
It is estimated from how often the Gadwall is recorded against all the birds logged in Ranchi (6 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.
