Purple roller

The purple roller (Coracias naevius), or rufous-crowned roller, is a medium-sized bird widespread in sub-Saharan Africa. Compared with other rollers its colours are rather dull and its voice rather harsh and grating.

The name "purple roller" can also refer to the azure dollarbird (Eurystomus azureus) of Indonesia.

Purple roller
Etosha National Park, Namibia
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Aves
Order: Coraciiformes
Family: Coraciidae
Genus: Coracias
Species:
C. naevius
Binomial name
Coracias naevius
Daudin, 1800
Synonyms
  • Coracias naevia
  • Coracias noevia
  • Coracias noevius

Taxonomy and systematics

Subspecies

Two subspecies are recognized:[2]

  • Lilac-throated roller (C. n. naevius) - Daudin, 1800: The common name for this subspecies is also used as an alternate name for the lilac-breasted roller. Found from Senegal and Gambia to Somalia and northern Tanzania
  • C. n. mosambicus - Dresser, 1890: Originally described as a separate species. Found from Angola and southern Democratic Republic of Congo to Namibia northern South Africa

Description

The purple roller is the largest of the rollers, growing to a length of 35 to 40 cm (14 to 16 in). From a distance it appears a dull brownish bird with a white stripe over the eye, a patch of white on the nape and a dark tail. Northern populations tend to have a rufus crown while southern populations have a more olive-green crown. The underparts are purplish-pink streaked with white. The wings are long and rounded while the tail is square-cut. The voice is a rather grating "ka" or "gaa", repeated rapidly and evenly.[3]

Behaviour and ecology

Its preferred habitat is dry thornveld where it spends long periods perched at the top of thorn trees or poles, watching for food items such as insects, spiders, scorpions and small lizards on the ground. It rocks to-and-fro about its longitudinal axis during display flights, calling raucously all the while; starting from above the treetops it plummets towards the ground in rolling flight. It is territorial, and during the breeding season will drive off other rollers, small hawks and crows.[3]

Purple roller, or rufous-crowned roller

This species seems to be an opportunist breeder, possibly linked to rains, as its breeding season varies from place to place. It nests in natural hollows in trees or uses old woodpecker holes, or in cliffs, riverbanks, pipes or holes in masonry, usually laying three white eggs. The young are fed and incubated by both parents.[3]

References
  1. BirdLife International (2016). "Coracias naevius". IUCN Red List of Threatened Species. 2016: e.T22682892A92967155. doi:10.2305/IUCN.UK.2016-3.RLTS.T22682892A92967155.en.
  2. "IOC World Bird List 7.1". IOC World Bird List Datasets. doi:10.14344/ioc.ml.7.1.
  3. Fry, C. Hilary; Fry, Kathie (2010). Kingfishers, Bee-eaters and Rollers. Bloomsbury Publishing. pp. 287–288. ISBN 978-1-4081-3525-9.
  • Roberts' Birds of Southern Africa - 6th edition (John Voelcker Fund, 1993) ISBN 0-620-17583-4
This article is issued from Wikipedia. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.