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The blue rock thrush (Monticola solitarius) is a chat species, reminiscent of a thrush, with a starling-like stature, measuring 21–23 cm in length. The male of the nominate subspecies is predominantly blue-grey, save for darker wings, presenting a striking appearance. Females and immature birds are less vivid, with dark brown upperparts and paler, scaly brown underparts. The male of the subspecies M. s. philippensis is distinguished by rufous-chestnut plumage from the mid-breast to the undertail, a feature absent in both sexes of the rock thrush.
To identify the blue rock thrush, look for the male's unmistakable blue-grey plumage and the female's less conspicuous brown tones. The male M. s. philippensis can be recognized by its rufous-chestnut lower half. Both sexes lack the reddish outer tail feathers seen in rock thrushes.
This bird favors open, mountainous regions where it can nest in rock cavities and walls.
