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really nice social call,
Only slightly different from the social call in the field guide! I jest... It's very interesting to hear the incredible variety of calls.
It's always nice to learn something new and for this call to be associated with a particular behaviour is truly, for me, a wonderful thing.
Really interesting find!
I'm pretty sure this is a social call produced by either a common or soprano pipistrelle. Results in a mobbing response if played back.
and it was nothing like this... Here it is. http://talk.batdetective.org/objects/ABD000cdjh
I've only ever seen one other clip where there was definitely something gone wrong in the microphone/ect that made the calls sound weird,
... call. This looks very slightly overloaded so it may have caused some distortion to the tail end of the FM call.
That said, it's definite the strangest potential bat I've ever seen here.
I am always skeptical when it comes to social calls :/ so, I'm very inclined to agree. Looking again, there is a call just after the FM...