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ɪ d iː /) is a family of Old World birds, which are known as rollers because of the aerial acrobatics some of these birds perform during courtship or territorial flights. The family contains 13 species and is divided into two genera .
Indian roller in flight showing the intense purple-blue and pale blue bands on wings and tail. The Indian roller is a bulky and broad-winged bird with a large head and short neck and legs. [10] [14] It has a body length of 30–34 cm (12–13 in) with a wingspan of 65–74 cm (26–29 in) and weighs 166–176 g (5.9–6.2 oz).
The European roller is a stocky bird, the size of a Eurasian jay at 29–32 cm (11–13 in) in length with a 52–58 cm (20–23 in) wingspan. [13] It is mainly blue with an orange-brown back. [citation needed] The European roller is striking in its strong direct flight, with the brilliant blue contrasting with black flight feathers.
The racket-tailed roller is so named for the conspicuous elongated outer feathers on its tail which have long streamers ending in paddle-shaped tips. The bird is 28 to 30 cm (11 to 12 in) long with the streamers extending another 8 cm (3 in). The forehead and superciliary streak are white, the crown dull green, the back rufous and the tail blue.
The Indochinese roller (Coracias affinis) or Burmese roller, is a member of the roller bird family. It occurs widely from Nepal , eastern India to Myanmar and Southeast Asia . It is listed as Least Concern on the IUCN Red List .
Alternate names for the oriental dollarbird include the Asian dollarbird, dark roller, dollar roller, dollarbird, eastern broad-billed roller and oriental broad-billed roller. Ten subspecies are recognized: [6] E. o. cyanocollis – Vieillot, 1819: Found from the Himalayas through China to south-eastern Siberia, Korea and Japan
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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.