white-throated treerunner Pygarrhichas albogularis

Distinctive little bird of native temperate forests. Usually found in pairs or small groups, creeping along trunks and branches (like Northern Hemisphere nuthatches), mainly in canopy but sometimes lower down. Often travels in association with Thorn-tailed Rayaditos. Identified by shape and behavior, plus its contrasting white bib, dark head (lacks golden brow of rayadito), and bold white spots on belly.