Spartonoica maluroides
Silhouette: Sheatherius · PhyloPic
In 3 days <5%
The bay-capped wren-spinetail (Spartonoica maluroides) is a species of bird in the Furnariinae subfamily of the ovenbird family Furnariidae. It is found in Argentina, Brazil, Paraguay, and Uruguay. The bay-capped wren-spinetail is the only member of genus Spartonoica and has no subspecies.
The bay-capped wren-spinetail was originally described as Synallaxis maluroides. It was later placed in genus Asthenes but has been recognized in Spartonoica starting in 1950. Genetic data show that it is not closely related to genus Asthenes but instead is sister to the cachalotes of genus Pseudoseisura.
The bay-capped wren-spinetail is 13 to 14.5 cm (5.1 to 5.7 in) long and weighs about 10.5 g (0.37 oz). The sexes have the same plumage. Adults have a whitish supercilium on an otherwise sandy brown face. Their crown is rufous. Their upperparts are sandy brown to olive-brown with bold black streaks on the nape and upper back. Their wings are brown with cinnamon at the base of the flight feathers. Their tail is mostly brown and graduated with pointed feathers; the central pair have some black. Their underparts are whitish with a buff or cinnamon tinge... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|
More parks will be added in future updates.
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Buenos Aires | 🇦🇷 Argentina |
Rare
Under 5% of wildlife watchers report a Bay-capped Wren-Spinetail sighting in Buenos Aires on a given day, based on 34 verified sightings from GBIF citizen-science data. It is the 226th most-seen of the 274 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 Bay-capped Wren-Spinetail in Buenos Aires on a given day, so our monthly data shows no clear season.
Between 8 and 11 am
Across all the parks we cover, that three-hour window holds the most Bay-capped Wren-Spinetail sightings with a recorded time, and about 9 in 10 of them come between 6 am and 6 pm: it is a daytime animal.
Only Buenos Aires, in our data
Buenos Aires is the only city on Wallace's Line with enough records to rate Bay-capped Wren-Spinetail sightings: under 5% of wildlife watchers there report one on a given day.
Same family: Furnariidae
The closest relatives of the Bay-capped Wren-Spinetail that you can see in Buenos Aires (family Furnariidae, Ovenbirds and Woodcreepers) are Rufous Hornero (about 90%), Narrow-billed Woodcreeper (about 40%) and Sooty-fronted Spinetail (about 30%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Bay-capped Wren-Spinetail is recorded against all the birds logged in Buenos Aires (34 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.
