Semper and Sclater (1872) describe the white-breasted thrasher as an "inquisitive and noisy bird" that would often "keep up a constant warning chatter, and throw itself about in all sorts of contortions" when being disturbed.

[4] An adult bird has a dark brown plumage with a white throat, breast, and belly.

[9] The Martinique thrasher prefers deciduous tropical dry forests and shrub lands.

[4] Low canopy shrubs and clear spaces are avoided by both subspecies because of predation, especially during breeding.

[4][6][10] Because Martinique thrashers are ground-foraging birds, they are mostly vulnerable to small mammals attacks, but they are also often victim of egg predation.

[11][12] Vocalization repertoire of the Martinique thrasher is limited which is surprising for a species that belongs to Mimids.

[3][10] The Martinique thrasher's breeding season starts mid-April and lasts until the end of September.

[10] The Martinique thrasher total population is estimated at 133-267 individuals and is ranked as "endangered" according to the IUCN Red List.

However, this predation places an additional burden on the already small thrasher population, especially where rats and mongooses are more abundant.