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Coraciidae (/ k ɒr ə ˈ s aɪ. 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 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 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.
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).
Eurystomus is a genus of roller, one of the two genera in that family of birds. The name means ‘broad mouth’, from the Greek eurus (εὐρύς, ‘broad, wide’) and stoma (στόμα, ‘mouth’). [1] Eurystomus contains four broad-billed species, which breed in Africa, Asia and Australasia.
Coracias is a genus of the rollers, an Old World family of near passerine birds related to the kingfishers and bee-eaters.They share the colourful appearance of those groups, blues and browns predominating.
The Oriental dollarbird (Eurystomus orientalis) is a bird of the roller family, so named because of the distinctive pale blue or white, coin-shaped spots on its wings. It can be found from Australia to Korea, Japan and India.
The cuckoo-roller is at the root of a group that contains the Trogoniformes, Bucerotiformes, Piciformes, and Coraciiformes. [3] Despite its name, the Cuckoo-roller does not share close evolutionary origins with cuckoos or rollers. [4] It is a medium-large bird, inhabiting forests and woodlands in Madagascar and the Comoro Islands.