Marmora's warbler / Sardengrasmücke (Sylvia sarda)

Classification: Genus Sylvia (Sylvia); Subfamily Sylviinae (Sylviinae); Family Old world warblers (Sylviidae)
General:

Marmora's warbler (Curruca sarda) is a typical warbler, genus Sylvia. The specific sarda is a Latin feminine form for a person from Sardinia.^[2] [more]
Song:

Song hurried and similar to both Sardinian, Dartford and Spectacled Warbler, but is softer with more tinny timbre. Interwoven soft rolling "trrrrtrrr" usually become more prominent towards the end of each phrase which often is concluded by 3-4 clear whistling "wit". [Link]
Calls:

Alarm call a short, Stonechat-like and grating "treck", very different from both Balearic and Dartford Warbler. [Link]
Physical details: length=12 cm, wingspan=13-17 cm, weight=8-12 g

🔍 No documented observation