A fairly small bird of montane forest. Blue-gray plumage, with contrasting blackish wings and tail. Perches low down, often on diagonal branches or vertical mossy trunks, flicking its tail and scanning the ground for insects. Very similar to Smoky Robin, but Blue-gray has a distinct bluish tinge to the gray, lacks the paler belly and has more contrasting black wing feathers. Several different vocalizations, including mournful, monotonous whistles, an up-and-down, whistled jumble and a rasp.