Louisiana Waterthrush vs Northern Waterthrush

In short

The Louisiana Waterthrush and Northern Waterthrush are similar in appearance, but key differences include the Louisiana's larger size and more prominent white supercilium. Both species wag their tails, but the Louisiana Waterthrush is more associated with streams, while the Northern prefers bogs and mangroves.

Identification tips

1. Look for the white supercilium extending beyond the eye in the Louisiana Waterthrush. 2. Note the cleaner throat and underparts of the Louisiana. 3. Observe the habitat: streams for Louisiana, bogs and mangroves for Northern. 4. Listen for the loud, ringing song of the Louisiana Waterthrush.

Size

The Northern Waterthrush is smaller in body and bill compared to the Louisiana Waterthrush.

Plumage

The Louisiana Waterthrush has a brighter, more pronounced white supercilium that extends beyond the eye, while the Northern Waterthrush's supercilium is creamier and less distinct. The Louisiana also has a cleaner, whiter throat and less streaking on the underparts.

Behaviour

Both species exhibit tail-wagging behavior, but the Northern Waterthrush is known to be more aggressive towards conspecifics, especially in overlapping ranges.

Habitat

The Louisiana Waterthrush is typically found along forested streams, while the Northern Waterthrush prefers bogs, swamps, and mangrove forests, especially during migration and winter.

Voice

The Louisiana Waterthrush has a loud, ringing song that carries over the sound of rushing water, while the Northern Waterthrush's song is less resonant and more variable.