A plump ball on sticks. Uncommon and elusive on forest floor in humid evergreen forest of tropical lowlands and foothills; also in humid pine-oak and fir forest of mountains in central Mexico. Moves quickly and stealthily on long legs. May be seen feeding or hopping along quiet trails and roads. Flushes with a whir of wings without calling. Note obvious pale mustache and pale rusty underparts; dark scaly markings on upperparts often hard to see.