Eurasian crag-martin / Felsenschwalbe (Ptyonoprogne rupestris)

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Wikipedia: Eurasian crag-martin Europe
Classification: Genus Ptyonoprogne; Family Swallows (Hirundinidae)
Deutschland: Brut-, Zugvogel RL R
Vocalization: Most heard is a House Martin-like, but less rolling, "prit" or "check". Other contact sounds include a plaintive "peeuuu". [Link]
Song: Song an inconspicuous, staccato series of twittering notes, with a wagtail-like timbre. [Link]
Physical details: length=14 cm, wingspan=32-34 cm, weight=17-30 g