Small, dark understory tetraka. Has yellowish underparts and a gray ear patch. Active bird that often pokes into clusters of dead leaves. Frequently joins flocks with tetrakas and other birds. Most common vocalization is an explosive up-and-down series of high-pitched notes. Larger, longer-tailed, and with darker underparts than other jeries. Unlike Cryptic Warbler, inhabits the understory, is much darker, and has a gray ear patch. Unlike Rand’s Warbler, has an indistinct eye-stripe and a greenish back.