There is also a 3rd UK resident species of pipistrelle called Nathusius’ pipistrelle.
Records of this bat are of interest to us. If you hear a Nathusius’ pipistrelle, with a peak frequency below 40kHz, please make a note on an additional sheet with the location and time but do not record on your form.
If you hear a pipistrelle with a peak frequency between 40 and 44kHz this is unsure as it could be either a Nathusius or a common (45) pipistrelle.
What to Record at Spots
Summary of pipistrelle peak frequencies:
When you have completed the spot, get ready for the next walk by re-tuning your detector to 25kHz.
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