Thalassornis leuconotus
Silhouette: Sheatherius · PhyloPic
In 3 days ~30% in a week ~60%
The white-backed duck (Thalassornis leuconotus) is a waterbird of the family Anatidae. It is distinct from all other ducks, but most closely related to the whistling ducks in the subfamily Dendrocygninae, though also showing some similarities to the stiff-tailed ducks in the subfamily Oxyurinae. It is the only member of the genus Thalassornis.
These birds are well adapted for diving. On occasions they have been observed to stay under water for up to half a minute. They search especially for the bulbs of waterlilies, but also seeds and leaves of waterlilies and other water plants and the young feed on lake flies larvae as well. From danger, they also escape preferentially by diving; hence, the namesake white back is hardly visible in life.
White-backed ducks live in Africa, especially between Senegal and Chad in the west, Ethiopia in the east, and South Africa in the south. Their habitat consists of lakes, ponds, swamps and marshes where they are well camouflaged against predators.
There are two subspecies, Thalassornis leuconotus leuconotus and Thalassornis leuconotus insularis. The latter lives entirely on Madagascar... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | iSimangaliso Wetland Park | 🇿🇦 South Africa | |
| 2 | Arusha National Park | 🇹🇿 Tanzania | |
| 3 | Amboseli National Park | 🇰🇪 Kenya | |
| 4 | uMkhuze Game Reserve | 🇿🇦 South Africa | |
| 5 | Moremi Game Reserve | 🇧🇼 Botswana | |
| 6 | Garden Route National Park | 🇿🇦 South Africa | |
| 7 | Hwange National Park | 🇿🇼 Zimbabwe | |
| 8 | Nairobi National Park | 🇰🇪 Kenya | |
| 9 | Kruger National Park | 🇿🇦 South Africa |
| # | Zoo / Centre | Country | |
|---|---|---|---|
| 1 | Slimbridge Wetland Centre | 🇬🇧 United Kingdom | |
| 2 | The Green Zoo Wuppertal | 🇩🇪 Germany | |
| 3 | Centro Cicogne e Anatidi | 🇮🇹 Italy |
With luck
About 10% of wildlife watchers report a White-backed Duck sighting in Nairobi on a given day, based on 157 verified sightings from GBIF citizen-science data. It is the 62nd most-seen of the 234 birds we can rate there. Over three days the chance rises to about 30%, and over a week to about 60%, if each day is a fresh chance.
March and October
In those months about 20% of wildlife watchers report a White-backed Duck in Nairobi on a given day, against about 10% in April–September and November–February, the lowest months.
Between 9 am and noon
Across all the parks we cover, that three-hour window holds the most White-backed Duck sightings with a recorded time, and nearly all of them come between 6 am and 6 pm: it is a daytime animal.
Yes
Of the 2 cities where we can rate White-backed Duck sightings, Nairobi has the highest daily chance: about 10%. Next come Cape Town (South Africa, under 5%).
Same family: Anatidae
The closest relatives of the White-backed Duck that you can see in Nairobi (family Anatidae, Ducks, Geese, and Swans) are Egyptian Goose (about 20%), African Black Duck (about 10%) and Yellow-billed Duck (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the White-backed Duck is recorded against all the birds logged in Nairobi (157 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.
