The social calls are between 20 to 30kHz, audible … 45 recordings contained more than 10 calls. 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: I have number of these calls on record now, including one on emergence from a house roost. When obstacles are close, FM – QCF calls are with peak frequencies of 38 – 43 kHz. Maximum frequency: 48.5 kHz Roosts. Facts compiled for BatLife Europe. Echolocation calls of Nathusius’ pipistrelle are similar to those of the other pipistrelles. Spectrogram, FFT size 2048, Hanning window. 30 kHz 60 kHz-90 dB -70 dB -50 dB -30 dB-10 dB These were further investigated for behavioural clues. Call duration: 7.7 ms . The peak intensity of the call is lower than the other two species, however, at about 38kHz (between 36 and 40kHz). (1997), are listed below: Interpulse interval: 103.0 ms . The social calls are between 20 to 30kHz, audible … 0.100 0.200 0.300 0.400 0.500 0.600 0.700 sec. I've never seen more than one natterers at a time. 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). This was low and close pass along a grass ride. These include: (1) resident males, Average values for a Nathusius' pipistrelle echolocation call, as given by Vaughan et al. Echolocation calls of Nathusius’ pipistrelle are similar to those of the other pipistrelles. Mating behaviour The mating system of Nathusius’ pipistrelle is a dynamic system controlled by female choice and various behavioural strategies of males. In autumn and winter it migrates in a south-westerly direction (Strelkov, 1969) and returns during the late spring (Aellen, 1983). ... Nathusius’ Pipistrelle bat is a seasonal long-distance (1000 km) migrant. Unconfirmed but possible Nathusius's Pip. You can see the ground reflection too. The peak intensity of the call is lower than the other two species, however, at about 38kHz (between 36 and 40kHz). Manual analysis of the first recording by MW suggests presence of common pipistrelle peak 4682Hz and soprano pipistrelle 5300Hz after FD. See more below. Minimum frequency: 39.2 kHz . PDF | Bat Species of the Year 2015: Nathusius' pipistrelle. - Left. Males establish mating territories along the migration routes Up to 12 ms long QFC calls with peak frequencies of 38 – 43 kHz. 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. 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. soprano pipistrelle, the peak frequency at 55 kHz is shown by the darker colour on the sonogram in the lower window. 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