Vireolanius melitophrys
Silhouette: Sheatherius · PhyloPic
In 3 days ~20% in a week ~40%
The chestnut-sided shrike-vireo (Vireolanius melitophrys), sometimes called the honey-browed shrike-vireo, is a species of bird in the family Vireonidae, and probably the largest member of the entire family. A widespread species of subtropical and tropical moist montane forests, this species is found from Jalisco and San Luis Potosí, Mexico in the north to southern Guatemala.
One of four species within the genus Vireolanius. The exact relationships of Vireolanius to other members of Vireonidae are not fully resolved, but it appears to be one of the basal groups within the New World Vireonidae along with Cyclarhis possibly Hylophilus. Within the genus Vireolanius, the chestnut-sided shrike-vireo appears to be the outgroup with respect to all other shrike-vireos.
Two or three subspecies are recognized, depending on the taxonomic list being used. One of the largest species in Vireonidae, with a length of 16.5 to 18 cm (6.5 to 7.1 in) and a mean body mass of 34.7 g... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | El Triunfo | 🇲🇽 Mexico | |
| 2 | Reserva de la Biosfera Mariposa Monarca | 🇲🇽 Mexico |
With luck
About 10% of wildlife watchers report a Chestnut-sided Shrike-Vireo sighting in El Triunfo on a given day, based on 11 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 188th most-seen of the 221 birds we can rate there. Over three days the chance rises to about 20%, and over a week to about 40%, if each day is a fresh chance.
April
In that month about 30% of wildlife watchers report a Chestnut-sided Shrike-Vireo in El Triunfo on a given day, against under 5% in May and July–March, the lowest months. That is one of El Triunfo's driest months, with about 65 mm of rain against 420 mm in June. June has too few records to rate.
Between 8 and 11 am
Across all the parks we cover, that three-hour window holds the most Chestnut-sided Shrike-Vireo sightings with a recorded time, and about 9 in 10 of them come between 6 am and 6 pm: it is a daytime animal.
Yes
Of the 2 parks where we can rate Chestnut-sided Shrike-Vireo sightings, El Triunfo has the highest daily chance: about 10%. Next come Reserva de la Biosfera Mariposa Monarca (Mexico, about 10%).
GBIF citizen-science records
It is estimated from how often the Chestnut-sided Shrike-Vireo is recorded against all the birds logged in El Triunfo (11 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.
