(1997), are listed below: Interpulse interval: 103.0 ms . ... Nathusius’ Pipistrelle bat is a seasonal long-distance (1000 km) migrant. I've never seen more than one natterers at a time. Spectrogram, FFT size 2048, Hanning window. When obstacles are close, FM – QCF calls are with peak frequencies of 38 – 43 kHz. Facts compiled for BatLife Europe. Average values for a Nathusius' pipistrelle echolocation call, as given by Vaughan et al. Up to 12 ms long QFC calls with peak frequencies of 38 – 43 kHz. Echolocation calls of Nathusius’ pipistrelle are similar to those of the other pipistrelles. 0.100 0.200 0.300 0.400 0.500 0.600 0.700 sec. 45 recordings contained more than 10 calls. See more below. The peak intensity of the call is lower than the other two species, however, at about 38kHz (between 36 and 40kHz). Maximum frequency: 48.5 kHz A total of 151 recordings of call sequences of Pipistrellus nathusii (Nathusius' pipistrelle) were made during 20 nights over an entire autumn migration season (8 August – 30 November 2017). Nathusius’ Pipistrelle are not the easiest bats to identify and we are grateful to Jon Russ for his help in confirming recordings. A rule of thumb is that if the peak frequency is below 40KHz it might be a Nathusius , but might not be, and the social calls are even worse to disentangle. Mating behaviour The mating system of Nathusius’ pipistrelle is a dynamic system controlled by female choice and various behavioural strategies of males. Echolocation calls of Nathusius’ pipistrelle are similar to those of the other pipistrelles. PDF | Bat Species of the Year 2015: Nathusius' pipistrelle. In autumn and winter it migrates in a south-westerly direction (Strelkov, 1969) and returns during the late spring (Aellen, 1983). The peak intensity of the call is lower than the other two species, however, at about 38kHz (between 36 and 40kHz). Males establish mating territories along the migration routes The social calls are between 20 to 30kHz, audible … Unconfirmed but possible Nathusius's Pip. Call duration: 7.7 ms . I have number of these calls on record now, including one on emergence from a house roost. A segment from 34:17 to 34:22 (eg see segment 200928_0125138 below) in the second recording appears to show some social calls ~30kHz and in bursts of about 3: Habitat. - Left. These were further investigated for behavioural clues. Roosts. 30 kHz 60 kHz-90 dB -70 dB -50 dB -30 dB-10 dB The peak frequency of their call is typically between 35 (30) and 40 (43) kHz, depending on the habitat and the presence of other individuals. Nathusius’ pipistrelle, Pipistrellus nathusii (Keyserling & Blasius 1839) is found from western Europe to Asia Minor (Corbet & Harris, 1991). 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