The dark-sided thrush, known scientifically as Zoothera marginata, is a modestly sized bird, measuring between 24 to 25 centimeters in length and tipping the scales at approximately 80 grams. It boasts a notably elongated blackish bill. The plumage presents a stark contrast with a dark brown head and rufous-brown wings. A distinctive white loral stripe and eyering adorn the face, complemented by a whitish throat and chin.
When endeavoring to identify the dark-sided thrush, look for its long blackish bill and the contrasting dark brown and rufous-brown plumage. The white loral stripe and eyering are key features, along with the bird's whitish throat and chin.
This species is most at home in broadleaf forests, particularly favoring damp areas and the vicinity of rocky streams. It can also be found amidst reeds and bamboo within these forested landscapes.
The dark-sided thrush enjoys a discontinuous distribution across the eastern Himalayas, extending into the higher regions of Burma, northern Thailand, Laos, Vietnam, and the southernmost parts of China. While generally sedentary, it may descend from higher altitudes during winter months and has been recorded as a vagrant in Bangladesh.
The dark-sided thrush is not a common sight, potentially due to its cryptic plumage and reclusive nature. It is a bird that often goes unnoticed, blending seamlessly into its forested habitat.
Listeners can expect a series of monotone thin whistles from the dark-sided thrush, a call that may aid in its detection amidst the dense foliage where it resides.
The IUCN Red List categorizes the dark-sided thrush as Least Concern, indicating that, at present, there are no immediate threats to its population numbers that would warrant a higher level of concern.