These type A and type C social calls were recorded while a serotine bat wes seen entering the maternity roost in the evening.

Date of recordings: 2026-06-03          Recorded by: Sarah Mahie          Audio files: 1140300, 1140301, 1140302, 1140304, 1140308 (Batlogger), 1140310 (Echo Meter)

These type A and type C social calls were recorded while serotine bats were seen entering their roost, where 19 individuals reside, in the early morning.

Date of recordings: 2026-04-25          Recorded by: Sarah Mahie          Audio files: 1137839, 1137842, 1137845 (Echo Meter), 1137826, 1137827, 1137829, 1137831, 1137832 (Batlogger)

The following recording starts with some type C social calls that go lower in frequency than the regular echolocation calls of the serotine bat and the recording ends with a series of FM-calls (type B social calls).

Date of recording: 2026-04-01          Recorded by: Willem Adema          Audio file: 1106135

A serotine was seen tapping its summer roost and just before entering, the bat emitted a type C social call whilst another serotine flew past.

Date of recording: 2026-05-21          Recorded by: Sarah Mahie          Audio file: 1136383 

A type C social call higher in frequency, emitted while two serotine bats were swarming in front of a building:

Date of recording: 2026-05-27 at 02:37         Location: Horst, Limburg

The following recording seems to be "buzzing" of the serotine bat. See previous years to read more about this phenomena.

Date of recording: 2026-06-02          Recorded by: Boaz van Die          Audio file: 1140392

Type C social calls emitted just before the two serotine bats were seen entering their roost in the early morning:

Date of recording: 2026-06-14          Recorded by: Boaz van Die          Audio file: 1145498

Social calls from within the roost before and during emergence:

Date of recording: 2026-06-20          Recorded by: Sarah Mahie          Audio file: 1148425, 1148430, 1148433, 1148438, 1148441 (Batlogger), 1148449, 1148457, 1148461, 1148464, 1148466 (Echo Meter)