Social calls of Nathusius' pipistrelle in the mating season of 2024

All social calls of the Nathusius' pipistrelle after the 15th of July.

During mating season, the part D of the type D social calls of the Nathusius' pipistrelle become prevalent.

Date of recordings: 2024-08-01          Recorded by: Niels Jansen          Audio files: 924349, 924352

Type D social calls of two individual Nathusius' pipistrelles. Part D2 aswell as part E are present.

Date of recordings: 2024-08-02          Recorded by: Ricardo Woudsma          Audio files: 924684 

Date of recordings: 2024-08-03          Recorded by: Sander Jager          Audio files: 924813 

Social calls of two individuals are present in the first snippit, since a part D call is emitted at the same time as a part A+B+C call.

Date of recordings: 2024-08-03          Recorded by: Victor Bonaccorso, Niels Jansen          Audio files: 924818 

Date of recordings: 2024-08-04          Recorded by: Ricardo Woudsma          Audio files: 924994, 924997 

Two different advertising Nathusius' pipistrelles in the same area. One male was emitting calls from behind the fascia board of a building (first three snippits) and the other male was emitting calls from a weep hole in a building (last three snippits). Note the difference in the use and the overall shape of their part D per individual.

Date of recordings: 2024-08-05          Recorded by: Niels Jansen          Audio files: 925299, 925297 

Date of recording: 2024-08-06          Recorded by: Olivier van Altena          Audio file: 925804 

Date of recording: 2024-08-07          Recorded by: Isis Knijff          Audio file: 925819 

Date of recording: 2024-08-07          Recorded by: Ricardo Woudsma, Aielynn Kleian          Audio file: 925831925837, 926253 

Date of recording: 2024-08-11          Recorded by: Aielynn Kleian          Audio file: 927312, 927315 

Date of recording: 2024-08-13          Recorded by: Declan Frerichs          Audio file: 927317 

Date of recording: 2024-08-14          Recorded by: Victor Bonaccorso          Audio file: 927333 

Date of recording: 2024-08-14          Recorded by: Nanieke van den Berg          Audio file: 927339, 927341 

Date of recording: 2024-08-15          Recorded by: Victor Bonaccorso          Audio file: 927477 

Date of recording: 2024-08-16          Recorded by: Kaia Pieters          Audio file: 947668 

Date of recording: 2024-08-16          Recorded by: Jari Spaans          Audio file: 928867 

Date of recording: 2024-08-17          Recorded by: Elise de Groot          Audio file: 928872 

Date of recording: 2024-08-17          Recorded by: Elise de Groot          Audio file: 928878 , 928880 

Interesting use of the syntax part A-B-C-B. This type D social call syntax appears five times in this recording. One time the syntact part A-B-C-B-C-B was used.

Date of recording: 2024-08-17          Recorded by: Elise de Groot          Audio file: 928887 

Almost continuously the use of part D motifs:

Date of recording: 2024-08-17          Recorded by: Douwe van der Wijk          Audio file: 928897, 928904 

A wavy-line call! At the same location where slow trills and other unusual social calls were recorded during spring.

Date of recording: 2024-08-17         Recorded by: Gert-Jan Hendriks          Audio file: 928168 

One of the longest part A's I have seen:

Date of recording: 2024-08-17          Recorded by: Sander Boersma          Audio file: 928070928072 

Date of recording: 2024-08-19          Recorded by: Hannah Floor          Audio file: 930256 

Nathusius' pipistrelle and common pipistrelle interacting:

Date of recordings: 2024-08-19          Recorded by: Iris van der Horn          Audio files: 930275, 930277 

Date of recording: 2024-08-19          Recorded by: Mathijs Hencricksen          Audio file: 930268, 930270930260, 930262 

Date of recordings: 2024-08-19          Recorded by: Jasper Geukemeijer          Audio files: 930043, 930042

Date of recordings: 2024-08-19          Recorded by: Aielynn Kleian          Audio files: 930227930235, 930236 

Date of recording: 2024-08-19          Recorded by: Levi Laluan          Audio file: 930316 

I have not encountered a recording before with this number of trills / wavy-line calls and trills of the Nathusius' pipistrelle. In total, I counted 9 wavy-line calls and 13 trills. A list of time stamps is written down on Xeno Canto.

Date of recording: 2024-08-19          Recorded by: Declan Frerichs          Audio file: 929731929707 

Date of recording: 2024-08-20          Recorded by: Sjoerd Luykx          Audio file: 929607 

Date of recording: 2024-08-20          Recorded by: Ermis Sarafopoulos, Izellah Kramer          Audio file: 930433, 930470 

Date of recordings: 2024-08-20          Recorded by: Iris van der Horn          Audio files: 930498, 930493, 930506, 930509, 930514 

Date of recordings: 2024-08-20          Recorded by: Levi Laluan          Audio files: 930551, 930556 

Date of recordings: 2024-08-20          Recorded by: Aielynn Kleian          Audio files: 930575, 930569, 930571, 930577 

Date of recording: 2024-08-20          Recorded by: Molito Fego          Audio file: 930537 

Date of recording: 2024-08-22          Recorded by: Molito Fego, Timo Boer          Audio file: 931602931592, 931598, 931587 

Date of recording: 2024-08-23          Recorded by: Daan Meerhof          Audio file: 930599 

Date of recording: 2024-08-23          Recorded by: Iris van der Horn          Audio file: 931764 

And during mating season, another recording was made containing three(!) wavy-line calls around 11 kHz. The motif Part E is also present three times, together with the syntax part B-C, part B-C-B, part A-B-C and a lot of singular used part B's.

The first wavy-line call is present in the recording of the batlogger M (first snippit) between 3,800s and 3,950s and in the recording of the Echo Meter Touch 2 (second snippit) between 8,400s and 8,550s.

The second wavy-line call is present in the recording of the batlogger M (first snippit) between 12,350s and 12,550s and in the recording of the Echo Meter Touch 2 (second snippit) between 15,250s and 15,400s.

The second wavy-line call is present in the recording of the batlogger M (first snippit) between 13,750s and 13,900s and in the recording of the Echo Meter Touch 2 (second snippit) between 16,350s and 16,450s.

The part E motifs:

Date of recordings: 2024-08-23, 2024-08-24         Recorded by: Sarah Mahie, Boaz van Die          Audio files: 929477, 929478, 932329 

Kaz witnessed multiple advertising Nathusius' pipistrelle advertising stationary on the same (rather big and complex) building.

This Nathusius' pipistrelle was seen flying around while emitting the calls and was seen tapping a building. Two possible wavy-line calls are present between 11,750s and 12,150s in the first snippit.

The following bat emitted some unusually shaped motifs.  The bat was emitting the social calls stationary for at least an half hour. The exact location of the bat couldn't be found while using a flash light. 

 Another Nathusius' pipistrelle was emitting the calls stationary from the wall of a building. The bat went silent when a flashlight was used to lighten the wall.

Date of recordings: 2024-08-24         Recorded by: Kaz Veldtrom          Audio files: (First example:) 929680929673, 929676  (Second example:) 929664, 929668  (Third example:) 929654929653 

Date of recording: 2024-08-24         Recorded by: Niels Jansen          Audio file: 932560 

Date of recording: 2024-08-24         Recorded by: Jasper Geukemeijer          Audio file: 931811 

Date of recording: 2024-08-24         Recorded by: Jasper Geukemeijer          Audio file: 931828, 931829 

Date of recording: 2024-08-24         Recorded by: Patrick Verschoor          Audio file: 931825 

Very interesting social calls (type D and type C) due to interaction between individuals. There appears to be numerous hooked echolocation calls present.

Date of recording: 2024-08-25         Recorded by: Aielynn Kleian          Audio file: 931845, 931846, 931847 

A Nathusius' pipistrelle emitting the calls in flight:

The same Nathusius' pipistrelle emitting social calls stationary from the ridge of the roof of a building:

Date of recordings: 2024-08-26         Recorded by: Ricardo Woudsma, Izellah Kramer, Paula Gerlag          Audio files: 929959930023, 930025, 930026930027930028, 930029930030930032931832, 931833, 932482, 932484, 932485, 932483 

Date of recordings: 2024-08-27         Recorded by: Cas van Joolingen, Daan Meerhof          Audio files: 936337931614, 931618 

Date of recording: 2024-08-28         Recorded by: Kaia Pieters          Audio file: 936333, 936334, 936335, 936336 

Date of recording: 2024-08-28         Recorded by: Timo Boer          Audio file: 931844 

Date of recording: 2024-08-28         Recorded by: Niels Jansen          Audio file: 936301 

Date of recording: 2024-08-28         Recorded by: Kaia Pieters          Audio file: 936307

Date of recording: 2024-08-29         Recorded by: Menno van Berkum          Audio file: 936327 

The interesting series of FM calls present between 8,500s and 8,750s in the recording is presumed to be emitted by the Nathusius' pipistrelle, but I can't exclude the serotine bat, whom is present aswell, from being the source.

Date of recording: 2024-08-31         Recorded by: Louis Nijholt          Audio file: 931760 

Date of recording: 2024-09-05         Recorded by: Sander Boersma          Audio file: 932327 

Date of recording: 2024-09-06         Recorded by: Patrick Verschoor, Milan Berghout          Audio file: 936326, 947666 

This advertising male was already found during a survey on the 22th of August. The bat was emitting calls almost non-stop during the 2 hour survey. Sadly, the recordings from that night were corrupted. Two weeks later, the male was still advertising in the same spot in an alley.

Date of recordings: 2024-09-06         Recorded by: Sarah Mahie          Audio files: 932460, 932461, 932464, 932466, 932467, 932470, 932469 

Date of recording: 2024-09-07         Recorded by: Sander Boersma          Audio file: 932534, 955918, 955919, 955920, 955922 

Date of recording: 2024-09-09         Recorded by: Luuk Verdonk          Audio file: 936304 

Date of recording: 2024-09-09         Recorded by: Milan Berghout          Audio file: 933783, 933784 

Date of recording: 2024-09-09         Recorded by: Sanneke de Neeling          Audio file: 933065, 933067933056, 933068 

Date of recordings: 2024-09-09         Recorded by: Kaia Pieters          Audio files: 933070933069 

Date of recording: 2024-09-09         Recorded by: Zoë Emmanouilidis          Audio file: 933077 

Date of recording: 2024-09-11         Recorded by: Roald Dorrestein          Audio file: 936313 

Date of recording: 2024-09-12         Recorded by: Iris van der Horn, Aielynn Kleian, Louis Nijholt          Audio file: 947658, 947659947653, 947655, 947656, 947660 

Date of recordings: 2024-09-13         Recorded by: Aielynn Kleian, Kaz Veldtrom          Audio files: 934230, 934232 

Date of recording: 2024-09-13         Recorded by: Lisa Vermaning          Audio file: 935107 

The following recording contain antagonistic behaviour, indicated by the social calls, between a Nathusius' pipistrelle and a common pipistrelle. At least two individual common pipistrelles were present. The lower frequency FM-calls are emitted by the Nathusius' pipistrelle and the two to three component social calls (two-component version is shown in the snippit on thre right) are presumed to be emitted by one of the two common pipistrelle.

Date of recording: 2024-09-15         Recorded by: Douwe van der Wijk          Audio file: 935110934063 

Date of recordings: 2024-09-15         Recorded by: Sarah Mahie          Audio files: 934221, 934225, 934226 

Date of recordings: 2024-09-15         Recorded by: Nils Reinerie, Demi Hoeke          Audio file: 934345, 934342934340

Date of recordings: 2024-09-16         Recorded by: Nanieke van den Berg, Aielynn Kleian, Levi Laluan          Audio files: 936302934061, 955924, 955926, 955937, 955940, 955941 

Date of recording: 2024-09-16         Recorded by: Patrick Verschoor, Louis Nijholt, Kaia Pieters          Audio file: 936315, 936316, 936328, 936338 

Date of recordings: 2024-09-16         Recorded by: Menno van Berkum, Isis Knijff          Audio files: 936303935111 

Date of recording: 2024-09-17         Recorded by: Louis Nijholt          Audio file: 947646 

Date of recording: 2024-09-17         Recorded by: Patrick Verschoor          Audio file: 936297 

Date of recordings: 2024-09-17         Recorded by: Nils Reinerie          Audio files: 936321, 936319, 936323 

Date of recording: 2024-09-17         Recorded by: Molito Fego          Audio file: 935301 

Date of recording: 2024-09-17         Recorded by: Levi Laluan          Audio file: 935730, 935731 

Date of recordings: 2024-09-17         Recorded by: Luuk Verdonk, Demi Hoeke          Audio files: 935734, 935735 

Date of recording: 2024-09-18         Recorded by: Nanieke van den Berg          Audio file: 947661, 947662 

Date of recordings: 2024-09-18         Recorded by: Thomas Janssen, Roxannna Hiemstra          Audio files: 936311, 936312 

Date of recordings: 2024-09-18         Recorded by: Niels Jansen, Aielynn Kleian          Audio files: 936324, 936325, 955832, 955833, 955834, 955917 

Date of recording: 2024-09-19         Recorded by: Gijs Peters          Audio file: 936308, 936329, 936330 

Date of recording: 2024-09-19         Recorded by: Douwe van der Wijk          Audio file: 936310 

Date of recordings: 2024-09-19         Recorded by: Niels Jansen          Audio files: 936341, 936344 

Date of recordings: 2024-09-20         Recorded by: Louis Nijholt, Aielynn Kleian          Audio files: 936305, 955831 

Date of recordings: 2024-09-20         Recorded by: Gijs Peters          Audio files: 936331, 937616 

Date of recording: 2024-09-22         Recorded by: Demi Hoeke          Audio file: 955830 


All recordings are licensed under the following Creative Commons Attribution-NonCommercial-NoDerivs 4.0 license and in courtesy of Sarah Mahie.
All sonograms are screenshots of the recordings imported in the ultrasound analysis software BatExplorer 2.2 (Elekon, Switzerland). 


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