Mysterious sounds in warm summer night can be really confusing. What in earth can make such a strange sounds. Wing clapping, cuick calls and on the top of all churring trill that can last several minutes. The artists is European nightjar (Caprimulgus europaeus). Funny looking bird that sings at dawn and dusk and rest of day stays silent. This migratory bird spends its winter time with lions in Africas savannahs.