Tchagra senegalus
Silhouette: Sheatherius · PhyloPic
In 3 days <5% in a week ~10%
The black-crowned tchagra (Tchagra senegalus) is a bushshrike. This family of passerine birds is closely related to the true shrikes in the family Laniidae, and was once included in that group. This species is found in the Arabian Peninsula and most of Africa in scrub, open woodland, semi-desert and cultivation.
In 1760 the French zoologist Mathurin Jacques Brisson included a description of the black-crowned tchagra in his Ornithologie based on a specimen collected in Senegal. He used the French name La pie-griesche gris du Sénégal and the Latin Lanius Senegalensis cinereus. Although Brisson coined Latin names, these do not conform to the binomial system and are not recognised by the International Commission on Zoological Nomenclature. When in 1766 the Swedish naturalist Carl Linnaeus updated his Systema Naturae for the twelfth edition, he added 240 species that had been previously described by Brisson. One of these was the black-crowned tchagra. Linnaeus included a brief description, coined the binomial name Lanius senegalus and cited Brisson's work. The species is now placed in the genus Tchagra that was introduced by the French naturalist René Lesson in 1831. Nine... Wikipedia →
Rare
Under 5% of wildlife watchers report a Black-crowned Tchagra sighting in Johannesburg on a given day, based on 38 verified sightings from GBIF citizen-science data. It is the 140th most-seen of the 219 birds we can rate there. Over three days the chance rises to under 5%, and over a week to about 10%, if each day is a fresh chance.
Any time of year
In every month with enough records, under 5% of wildlife watchers report a Black-crowned Tchagra in Johannesburg on a given day, so our monthly data shows no clear season.
Between 7 and 10 am
Across all the parks we cover, that three-hour window holds the most Black-crowned Tchagra sightings with a recorded time, and about 9 in 10 of them come between 6 am and 6 pm: it is a daytime animal.
6th of 7
Of the 7 cities where we can rate Black-crowned Tchagra sightings, Johannesburg ranks 6th at under 5%. The best odds are in Mombasa (Kenya, about 20%), Harare (Zimbabwe, under 5%) and Accra (Ghana, under 5%).
GBIF citizen-science records
It is estimated from how often the Black-crowned Tchagra is recorded against all the birds logged in Johannesburg (38 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.
