Vocalisation Collection (page 5)
Barn swallow (Hirundo rustica) two young swallows on barn roof calling for food, Norfolk, UK, August
Whitethroat (Sylvia communis) male perched on Willow branch in spring, Wiltshire, England, UK, April
Edible frog (Rana esculenta) male calling at pond surface, Klein Schietveld, Brasschaat, Belgium May