The Swift calls CD is an amazingly accurate recording of nesting Swifts, produced at the Ulrich Tiggs Berlin Swift Colony. It is a well-known fact that Swifts don’t find a nesting location easily. Therefore, you can help them & speed up their search by playing the Swift calls CD early in the nesting season (May- June) & also later at the end of July, when young birds are trying to nest as well. Moreover, the Swift calls CD contains valuable & interesting information on swifts.