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(Tichodroma muraria), bird of the mountains of southern Europe to central Asia, largest member of the family Sittidae (order Passeriformes). About 17 cm (6 12 inches) long and mostly gray with broad, rounded black wings having central red patches, it has a long, thin, downcurved bill. In searching for insects on cliffs, it ascends jerkily while flicking its wings. In winter it may visit lowlands and climb the walls of city buildings.