The Kilmarnock Waxwings at Bonnyton are now down to just three. Yesterday was very foggy so I made some sound recordings of their calls - such a great sound! The first sonogram shows the trills of three birds as they take flight. The second illustrates the difference between perched and flight calls; slightly low pitched and longer in flight. The third sonogram is an enlargement of the flight call, lasting around 0.7 seconds.