
The dollarbird (Eurystomus orientalis), also known as the Oriental dollarbird or dollar roller, is a bird of the roller family, so named because of the distinctive blue coin-shaped spots on its wings. It can be found in south-west Pacific and east Asia from northern Australia to the Japan archipelago and India. It has a length of up to 30 cm. It i...
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http://en.wikipedia.org/wiki/Dollarbird

a common roller, Eurystomus orientalis, of Asia and Australia, having on its wings a silvery spot the size of a dollar.
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https://www.infoplease.com/dictionary/dollarbird
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