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Trochalopteron affine
Rare visitor: recorded only occasionally in this country
The black-faced laughingthrush (Trochalopteron affine) is a bird species in the family Leiothrichidae. It is found in the Eastern Himalayas. Its range extends from eastern Nepal eastwards to Arunachal Pradesh in India and further to Myanmar, along with Bhutan and southeastern Tibet. Small disjunct populations also exist in continental Southeast Asia. Trochalopteron affine is the scientific name used by the project species list. (Wikipedia, general species account).
Babblers and their close allies are typically active passerines of forest, scrub or dense undergrowth. Many move in pairs, family parties or mixed-species flocks while searching foliage, bark and leaf litter for invertebrates, sometimes supplementing them with fruit or seeds. Voice and social behaviour are often valuable identification clues. These statements provide family-level context and are not Vietnam-specific breeding measurements (general babbler ecology).