[4] The juvenile of this species has a plumage similar to that of an adult, but overall duller, with a brown eye ring and a greyish hue to its blue feathers, especially on its underside.

[7] This species is endemic to Sri Lanka, where it is found in tall, undisturbed forest in the mountains, foothills, and adjoining lowlands of the wet zone.

[5] In response to low and moderate levels of recreational disturbance, and small to medium-sized groups of human visitors, numbers of Sri Lanka blue magpies increased, unlike other birds.

[5] The Sri Lanka blue magpie produces a great variety of vocalizations, including a jingle, a chink-chink, crakrakrakrak, and a whee-whee[3].

[4] Their diet is mainly carnivorous, featuring insects, frogs, and small lizards, but they have been known to consume fruit, as well,[4] and some observations suggest that they also prey on eggs or young of other bird species.

[10] Sri Lanka blue magpies have been observed rubbing hairy caterpillars against mossy branches to remove irritating hairs prior to consuming them.

[3] The main threat to the survival of the Sri Lanka blue magpie is habitat loss due to forest being cleared for agricultural land, mines, logging, and human settlement.

[3] One of the factors preventing the Sri Lanka blue magpie from moving into disturbed habitat has been suggested to be the presence of another bird, the Asian koel (Eudynamys scolopaceus), which is a brood parasite.