To listen to social calls of the Nathusius' pipistrelle, you can visit the files of the following lists on Xeno Canto:

- Type A social calls of different species of bats
- Type B (roosting) social calls of multiple species of bats
- Type C social calls of multiple species of bats
- Type D (part D) social calls of the Nathusius' Pipistrelle
- Type D (part E) social calls of the Nathusius' Pipistrelle
- Type D (trills, wavy-line and other unusual) social calls of the Nathusius' Pipistrelle

The following recordings contains W-type social calls of the Nathusius' pipistrelle as described by Helena Jahelková (2011)! A little later, two bats were present and one bat emitted the more typical type D social calls, including the part D motif. Both bats were seen swarming around the top of the building and at least one bat was seen repeatedly tapping a certain spot near the roof. Jahelková describes the situation in which these social calls occur as follows:

"The advertisement calls of Nathusius' pipistrelle (Pipistrellus nathusii) show an unified structure: three main motifs which can be supplemented with additional two motifs especially during mating season. In May and June, a continuous social vocalization of quite unusual structure and composition was recorded apart from these standard calls. Most of these calls were designed in a long “wavy line” pattern with the peak frequency of 14–36 kHz, and were accompanied by standard or modified echolocation calls. In one case we succeeded to supplement the acoustic records with a complete record of behavioural details: two bats slowly flew and followed one another in a circular path in front of the roost, where they repeatedly performed false landings, and during approaching one of them emitted the unusual social calls."

Date of recording: 2025-05-19          Recorded by: Sarah Mahie, Boaz van Die          Audio file: 999877, 999879, 999881, 999883, 999885, 999889, 999892, 999895, 999896 (Batlogger), 999875 (Echo Meter)

The next day, the Nathusius' pipistrelle was still swarming around the same building. At moments, two individuals were seen cirkling each other. More type D social calls were emitted, including part D and part E motifs and 'chatter' of only part C motifs on lower frequencies than usual.

Date of recording: 2025-05-20          Recorded by: Sarah Mahie          Audio file: 1000403, 1000404 

Three weeks later, the same Nathusius' pipistrelle was still swarming in front, and tapping, the same roost entrance accompanied with series of social calls.

Date of recording: 2025-06-09          Recorded by: Sarah Mahie          Audio files: 1005386, 1005387, 1005388 

More W-type calls were recorded on a different location with modified (hooked) echolocation calls. According to Jahelková (2011), W-type social calls are often accompanied by modified echolocation calls. Bats were seen showing swarming-like behavior.

Date of recording: 2025-05-30          Recorded by: Martin de Jong          Audio file: 1008337 

And some more W-type calls were recorded on another location, also together with modified (hooked) echolocation calls!

Date of recording: 2025-06-15          Recorded by: Sarah Mahie          Audio files: 1006719, 1006732, 1006720, 1006722, 1006724, 1006725, 1006731, 1006738 

About 1.3 kilometers as the crow flies in distance from the previous recordings, type D social calls including a part E motif were also recorded later during that survey.

Date of recording: 2025-06-15          Recorded by: Sarah Mahie          Audio file: 1006727 

My brother encountered these very nice type A social calls! The bat was making sounds for about 10 to 15 minutes, went silent and a little later one bat left the roost.

Date of recording: 2025-05-14          Recorded by: Sander Boersma          Audio files: 998879, 998881, 998883, 998889, 998890, 998892, 998894, 998898 

Date of recording: 2025-06-15          Recorded by: Sarah Mahie          Audio files: 1006936, 1006940, 1006941, 1006923, 1006928, 1006930, 1006932, 1006934, 1006935, 1006938          Video footage by: Sarah Mahie

In a forrest, more part E motifs were recorded and a presumed part D (left in the first snippit) as well. There is also a maternity roost present in this forrest.

Date of recording: 2025-05-11          Recorded by: Sarah Mahie          Audio file: 997518, 997521, 997523, 997525, 997526 

We went to visit the maternity roost located in the previous mentioned forrest a month later. All types of social calls (A, B, C and D) were recorded. The roost is located in a dead tree. A lot of type C social calls that were recorded are very similar to the type C social calls of the common pipistrelle (Pipistrellus pipistrellus) that are indicative of juveniles - which is not surprising. Juvenile Nathusius' pipistrelles should be present at the time of the recordings.

Date of recording: 2025-06-18          Recorded by: Sarah Mahie, Boaz van Die          Audio file: 1007873, 1007874, 1007875, 1007877, 1007879, 1007880, 1007881, 1007882, 1007883, 1007884, 1007885, 1007886, 1007887, 1007888, 1007889, 1007891, 1007892, 1007893, 1007894, 1007896, 1007897, 1007898, 1007899, 1007900, 1007901, 1007902, 1007903, 1007904, 1008044, 1008045, 1008046, 1008047, 1008054, 1008055, 1008059           Video footage by: Sarah Mahie, Ingeborg Nollen

This might be the first time that have have seen a part C motif of the part D social call go down in frequency. Two wavy-line calls and a 'mordent' are present as well.

The sequence of the motifs B-C-B-E appears twice, the sequence part B-C is also used an there are multiple stand-alone type C social calls (similar to the part B motif).

Date of recording: 2025-06-17          Recorded by: Boaz van Die          Audio file: 1007516 (Echo Meter), 1007517 (Batlogger)

The same evening, but about 120 meters as the crow flies away in distance, more wavy-line calls, part E motifs and even a type D motif were recorded.

Date of recording: 2025-06-17          Recorded by: Sarah Mahie          Audio file: 1007546, 1007552, 1007549, 1007551