Each species account starts with a recording that aims to reflect a favourable listening experience, often including calls at a range of distances, either the same individual or several. This is a first impression of how the species may sound in the environment of a listening post. There is a representative sonagram. You can read about some of the peculiarities of this species’ migratory behaviour and Nocturnal Flight Calls (NFCs), for example, whether they differ from daytime calls, how many types, and how we came to know them, as well as further information.