The Brown-chested Martin is a common inhabitant of grasslands and other open habitats from Colombia south to Argentina. All populations of Brown-chested Martins have sandy upperparts and crown, white underparts and an indistinct brown breast band. The southern subspecies, fusca, also has a string of dusky marks down the center of the breast, and so often can be identified in the field. Brown-chested Martins can be distinguished from the similar Bank Swallow (Riparia riparia) by their much larger size. With a diet of flying insects, Brown-chested Martins forage by flying low and fast over grassland or open water. The southern subspecies fusca is migratory, and forms large post-breeding flocks of hundreds of thousands of birds. The southern populations of the Brown-chested Martins migrate as far north as Panama.