Pallas's Grasshopper Warbler vs Savi's Warbler

In short

Pallas's Grasshopper Warbler and Savi's Warbler are both small, elusive birds of the Locustellidae family, often found in dense vegetation. The most reliable field mark is the supercilium: Pallas's has a more pronounced and contrasting supercilium compared to Savi's. Their songs differ significantly, with Pallas's having a more varied and complex song.

Identification tips

1. Look for the pronounced supercilium in Pallas's Grasshopper Warbler. 2. Note the streaked back of Pallas's compared to the more uniform brown of Savi's. 3. Listen for the complex song of Pallas's versus the monotonous reel of Savi's. 4. Consider habitat: Pallas's often in wetter reed beds, Savi's can be in drier tall grasses.

Size

Both species are similar in size, with Pallas's Grasshopper Warbler being slightly larger, but this is not a reliable field mark.

Plumage

Pallas's Grasshopper Warbler has a more pronounced supercilium and a generally more streaked appearance on the back, while Savi's Warbler is more uniformly brown with less contrast.

Behaviour

Both species are secretive and skulk in dense vegetation, making them difficult to observe. They are often detected by their songs rather than by sight.

Habitat

Pallas's Grasshopper Warbler prefers wetter habitats with dense reed beds, while Savi's Warbler is often found in similar habitats but can also be found in drier areas with tall grasses.

Voice

Pallas's Grasshopper Warbler has a varied and complex song, while Savi's Warbler produces a more monotonous, reeling song.