Thrush Nightingale Bird is similar to and confusable with the Nightingale, it is a duller, cold earth-brown on the head and upperparts. The tail is more chestnut and of a deeper red tone, and although less bright than the corresponding parts of the Nightingale, this creates a noticeable contrast, particularly in flight. The underparts are drabber, with mottlings of grey-brown, forming clear malar stripes and extending into a dingy but noticeable breast band that contrasts with the white throat. Thrush Nightingale Bird is lightly mottled on whitish flanks, and the undertail coverts can show small dark spots on the sides.
Only a rare vagrant to Britain, but a summer visitor to southern Scandinavia and the Baltic region, where it replaces the Nightingale. Thrush Nightingale Bird favours similar habitats of dense, shady, scrubby undergrowth in broad-leaved woodland, hazel stands and waterside scrub, as well as parks and gardens with components of damp or swampy ground with rich leaf litter and humus. Feeds on the ground and often prefers to run rather than fly.
Some of Thrush Nightingale Bird calls are similar to those of the Nightingale, such as a flat Chiffchaff-like whistle "eep" or "whit", a hard croaking churr "khrrrrrrr", sometimes delivered together as "eeeep-khrrrrrr", and a short deep "chuk". The song is also similar to the Nightingale, but is louder and less sweet, with more deeper and lower frequency segments. It is delivered at a rather slower pace, and consequently phrases tend to be longer, typically lasting 4-6 seconds. It includes popping, tongue-clicking, glottal stops and harder rattles, and is highly variable, going something like "chow chow chiwerh' o chiwerh' o chiwerh' o chii'oh chii'oh chii'oh gkrgkrgkrgkrgkrgkr kh'kh'kh'kh'kh'kh'kh' shi" or "hwe cho hwe cho krrrre'i krrrre'i krrrre'i pocpocpoc chauw tsrit tsrit tsrit kna'kna'kna'kna chichichichi-si".