|Dollarbird at San Diego Zoo|
It contains four broad-billed species, which breed in Africa, Asia and Australasia. Two species are restricted to Africa, one of which, the cinnamon roller, is migratory. The Dollarbird has a large distribution ranging from India to Japan and Australia. It too is migratory over the northern and southern extremes of its range. The final species, the azure roller, is endemic to Moluccas in Indonesia. In general they are open country foragers, occurring in woodland, savanna and farmland. Two species, the azure roller and the cinnamon roller are associated with rainforests but nevertheless require open areas in which to forage.
The Eurystomus vary from the other genus of rollers, Coracias in having proportionally longer wings and shorter legs. These morphological differences reflect differences in foraging technique, whereas Coracias rollers forage from a fixed perch and take prey by swooping down onto it on the ground, the faster and more agile Eurystomus rollers catch their prey on the wing. Unlike the Coracias they do not perform the "rolling" display which gives the family its common name.
- Cinnamon roller or broad-billed roller Eurystomus glaucurus
- Blue-throated roller Eurystomus gularis
- Azure roller or azure dollarbird Eurystomus azureus
- Dollarbird or Oriental dollarbird Eurystomus orientalis
- William Somerville Orr (1855). Orr's circle of the sciences: a series of treatises on the principles of science, with their application to practical pursuits. p. 517.
- Fry, C (2001), "Family Coraciidae (Rollers)", in del Hoyo, Josep; Elliott, Andrew; Sargatal, Jordi, Handbook of the Birds of the World. Volume 6, Mousebirds to Hornbills, Barcelona: Lynx Edicions, pp. 342–369, ISBN 978-84-87334-30-6
- Kingfishers, Bee-eaters and Rollers by Fry, Fry and Harris, ISBN 0-7136-8028-8
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