Klappergrasmücke / Lesser whitethroat (Sylvia curruca)

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Wikipedia: Lesser whitethroat
Systematik: Gattung Sylvia; Unterfamilie Sylviinae; Familie Grasmücken (Sylviidae)
Had hoped to hear and see it in Toggenburg but I didn't; said to be possible in Engadin.
Gesang: Klappernd. (Müllerchen) An Berglaubsänger erinnernd. Klappertöne (5-8) Aber oft mit leisem schwatzendem Vorgesang, der fehlen kann. Kann auch an Sumpfmeise erinnern, doch sind bei dieser die Klappertöne mehr von oben her angeschlagen. [Link]
Song typically consists of two parts. An indistinct chattering and warbling, subsong-like part similar to Whitethroat, which is usually followed by a dry, fast and rattling trill. The trill carries much further than the chattering part. May be difficult to identify if trill is omitted. [Link]
Rufe: „tze“ oder „tett“ [Link]
Warning call a hard "check" similar to Blackcap but slightly softer. [Link]
Körperlich: Länge=12-13 cm, Flügelspanne=16-20 cm, Gewicht=10-14 g
Gesang: Song typically consists of two parts. An indistinct chattering and warbling, subsong-like part similar to [common] Whitethroat, which is usually followed by a dry, fast and rattling trill. The trill carries much further than the chattering part. May be difficult to identify if trill is omitted. [Link]
Gesang Eigenschaften: Melody: einfach rhythmisch, langsam, Frequency: 3-5 KHz Special sounds: Triller
Ruf: BirdID says: Warning call a hard "check" similar to Blackcap but slightly softer

♫ (Ruf)

Ruf Eigenschaften: Ruf Melodie: einnotig, langsam, Frequenz: 2-7 KHz, Spezielle Klänge: stottern/kieseln