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Grallinidae (magpie larks, mudnest builders; class Aves, order Passeriformes) A family of black and white or grey birds whose features are varied; the mudnest builders are often separated into a separate family, Corcoracidae. They inhabit forest, woodland, and scrub, and build mud nests stuck to a horizontal branch. There are three genera, with four species, found in Australia and New Guinea.