Campylorhynchus megalopterus
Silhouette: Andy Wilson · PhyloPic
In 3 days ~10% in a week ~20%
The gray-barred wren (Campylorhynchus megalopterus) is a species of bird in the family Troglodytidae. It is endemic to Mexico. The gray-barred wren has two subspecies, the nominate Campylorhynchus megalopterus megalopterus and C. m. nelsoni. The latter has been suggested as a separate species but there are only small differences between the subspecies in size and plumage and no apparent differences in their voices.
The gray-barred wren is 17 to 19.5 cm (6.7 to 7.7 in) long and weighs 32.8 to 33.5 g (1.16 to 1.18 oz). Both sexes of the nominate have a grayish crown with a black center, a black and white striped nape, and black shoulders and back barred with white. Their throat and chest are white with black spots and the flanks buff with blackish bars. C. m. nelsoni is the smaller of the subspecies and its underparts' spots and bars are grayish brown. The juvenile has a solid brown cap and is buff and brownish overall with no bars on the back and no spots on the chest.
The ranges of the two subspecies of gray-barred wren do not meet. The nominate is found in the Trans-Mexican Volcanic Belt from Jalisco and... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Reserva de la Biosfera Mariposa Monarca | 🇲🇽 Mexico |
More parks will be added in future updates.
Rare
Under 5% of wildlife watchers report a Gray-barred Wren sighting in Reserva de la Biosfera Mariposa Monarca on a given day, based on 5 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 98th most-seen of the 103 birds we can rate there. Over three days the chance rises to about 10%, and over a week to about 20%, if each day is a fresh chance.
January and November
In those months about 10% of wildlife watchers report a Gray-barred Wren in Reserva de la Biosfera Mariposa Monarca on a given day, against under 5% in February–March, May, October and December, the lowest months. Those are among Reserva de la Biosfera Mariposa Monarca's driest months, with about 30 mm of rain a month against 270 mm in July. April and June–September have too few records to rate.
Between 8 and 11 am
Across all the parks we cover, that three-hour window holds the most Gray-barred Wren 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 Reserva de la Biosfera Mariposa Monarca, in our data
Reserva de la Biosfera Mariposa Monarca is the only park on Wallace's Line with enough records to rate Gray-barred Wren sightings: under 5% of wildlife watchers there report one on a given day.
Same family: Troglodytidae
The closest relatives of the Gray-barred Wren that you can see in Reserva de la Biosfera Mariposa Monarca (family Troglodytidae, Wrens) are House Wren (about 30%) and Bewick's Wren (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Gray-barred Wren is recorded against all the birds logged in Reserva de la Biosfera Mariposa Monarca (5 verified sightings from 2019 to 2026), 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.
