Black-billed Nightingale-Thrush vs Orange-billed Nightingale-Thrush

In short

The bill color is the most reliable field mark: the Black-billed Nightingale-Thrush has a black bill, while the Orange-billed Nightingale-Thrush has an orange bill. Both species inhabit similar montane forests but differ in their vocalizations and subtle plumage details.

Identification tips

• Bill color: Black for Black-billed, orange for Orange-billed.
• Vocalization: Listen for the more melodic song of the Black-billed.
• Habitat: Note the elevation; Black-billed prefers higher elevations.
• Plumage: Look for subtle differences in tone; Black-billed is more uniformly grayish-brown.

Size

Both species are similar in size, typical of small thrushes.

Plumage

The Black-billed Nightingale-Thrush has a more uniform grayish-brown plumage, while the Orange-billed Nightingale-Thrush may show a slightly warmer tone with a more contrasting head and back.

Behaviour

Both species are often seen foraging on the ground or singing from low perches in dense thickets.

Habitat

Both species inhabit montane forests, but the Black-billed Nightingale-Thrush is more restricted to highland areas from 1800 m to the timberline, while the Orange-billed Nightingale-Thrush can be found in a wider range of elevations.

Voice

The Black-billed Nightingale-Thrush has a highly melodic song, whereas the Orange-billed Nightingale-Thrush's song is less musical and drier, with a nasal, upslurred call note.