Because of their nocturnal way of life they are less conspicuous than most birds, and also there are not so many species that do migrate (bats have developed the alternative wintering strategy of hibernation). Even if bats are occasionally observed on migration in daylight, they most likely fly by night and therefore they should resemble birds that are day-migrants. If they fuel in an area and then fly to the next stopover, or if they feed as they go are questions yet without an answer. We have initiated studies of bat migration with the goal of being able to illuminate some of the unanswered questions about bat migration.
During the autumn migration period 2009 (august - october) calls of migrating bats were recorded at Ottenby, Öland. These bats gave us information about which species migrate, the timing of migration and activity in relation to weather (winds). In November 2009 a conference devoted to bat migration in the Baltic region was held in Lund.
In september 2010 a preliminary attempt to track Nyctalus Noctula with radio transmitters was made at the Falsterbo peninsula, South Sweden.