Eurystomus glaucurus
Silhouette: Ferran Sayol · PhyloPic
In 3 days ~10% in a week ~20%
The broad-billed roller (Eurystomus glaucurus) is a member of the roller family of birds which breeds across tropical Africa and Madagascar in all but the driest regions. It is a wet season breeder, which migrates from the northern and southern areas of its range towards the moister equatorial belt in the dry season.
The broad-billed roller was formally described in 1776 by the German zoologist Philipp Ludwig Statius Müller under the binomial name Coracias glaucurus. The specific epithet is from Ancient Greek glaukos meaning "blue-grey". Statius Müller based his brief description on "Le Rollier de Madagascar" that had been described in 1775 by the French polymath Georges-Louis Leclerc, Comte de Buffon and illustrated by Edme-Louis Daubenton. The type locality is Madagascar. The broad-billed roller is now placed in the genus Eurystomus that was introduced in 1816 by the French ornithologist Louis Pierre Vieillot. A molecular phylogenetic study published in 2018 found that the broad-billed roller was most closely related to the blue-throated roller (Eurystomus gularis). Alternate names for the broad-billed roller include the African broad-billed roller and the cinnamon... Wikipedia →
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Kampala | 🇺🇬 Uganda | |
| 2 | Serrekunda | 🇬🇲 Gambia | |
| 3 | Accra | 🇬🇭 Ghana | |
| 4 | Lagos | 🇳🇬 Nigeria | |
| 5 | Cotonou | 🇧🇯 Benin | |
| 6 | Zanzibar City | 🇹🇿 Tanzania | |
| 7 | Ouagadougou | 🇧🇫 Burkina Faso | |
| 8 | Abuja | 🇳🇬 Nigeria | |
| 9 | Lomé | 🇹🇬 Togo | |
| 10 | Monrovia | 🇱🇷 Liberia |
Rare
Under 5% of wildlife watchers report a Broad-billed Roller sighting in Dakar on a given day, based on 6 verified sightings from GBIF citizen-science data. It is the 135th most-seen of the 152 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.
July–August and November
In those months about 10% of wildlife watchers report a Broad-billed Roller in Dakar on a given day, against under 5% in September–October and December–June, the lowest months. Those are among Dakar's wettest months, with about 95 mm of rain a month against almost none in May.
Between 9 am and noon
Across all the parks we cover, that three-hour window holds the most Broad-billed Roller sightings with a recorded time, and about 9 in 10 of them come between 6 am and 6 pm: it is a daytime animal.
11th of 12
Of the 12 cities where we can rate Broad-billed Roller sightings, Dakar ranks 11th at under 5%. The best odds are in Kampala (Uganda, about 40%), Serrekunda (Gambia, about 30%) and Accra (Ghana, about 30%).
Same order: Coraciiformes
The closest relatives of the Broad-billed Roller that you can see in Dakar (order Coraciiformes, Rollers, Kingfishers, and Allies) are Pied Kingfisher (about 30%), Little Bee-eater (about 30%) and Gray-headed Kingfisher (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Broad-billed Roller is recorded against all the birds logged in Dakar (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.
