Sri Lanka Blue Magpie is about the same size as the European Magpie at 42–47 cm. The adults are blue with chestnut head and wings, and a long white-tipped tail. The legs and bill are red. The young bird is a duller version of the adult. Sri Lanka Blue Magpie has a variety of calls including mimicry, a loud chink-chink and a rasping krak-krak-krak-krak.
It is scarce and usually shy, but locally common and bolder. It associates in flocks up to six or seven, but pairs or solitary individuals are sometimes met with. A very energetic, agile bird, most of its time is spent in searching for food among foliage at all levels from the ground to the tops of tall trees. It capture the critters like hairy caterpillars, green tree-crickets, various chafer beetles, tree-frogs and lizards. The breeding season is in the first quarter of the year, so far as is known, but the nest has seldom been found. The nest resembled a small crow’s nest. It is very well concealded among small twigs and foliage near the top of the tree. The eggs number three to five and are whitish, profusely spotted and speckled with various shades of brown. They measure about 30.5 x 22.1 mm.
It inhabits the heavy virgin forests of the mountains and wet-zone foot hills.