Very local in humid evergreen forest of limestone (karst) lowlands and foothills in northern Oaxaca and adjacent Veracruz; endemic. Stays on or near the ground, moving quickly among limestone boulders, popping in and out of caves and crevices. Like most wrens, heard more often than seen, but can be curious; sometimes appears at close range, bobbing and holding its tail cocked. Distinctive: rather chunky with a very long bill, a pale gray face marked with a dark cheek patch, and a rusty breast.