The underside of their body is white from the throat to the vent, though the breast has a gray tinge and the flanks are buffy with faint dark streaks.

M. s. modulator has some blackish brown spotting on its crown and back, lacks the gray tinge on the breast, and the flanks are paler and often unstreaked.

[3] The nominate subspecies of chalk-browed mockingbird is found in southern Suriname and adjoining Pará state in Brazil.

[3] The chalk-browed mockingbird is omnivorous; it feeds on fruits, seeds, berries, insects, and other small vertebrates.

The chalk-browed mockingbird's song is loud, a "varied series of notes, trills, [and] phrases".

It has a large range (estimated at 10,600,000 km2 (4,100,000 sq mi)), is very common throughout much of it, and the population is believed to be stable.

There are "[n]o perceived threats, although nesting losses due to cowbird parasitism are considerable.