Quote:
Originally Posted by Nick D 
In flight I hear a constant shrill calling. There seems to be 2 or 3 of them flying around.
Is there anything else it could be??
thanks
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Hallo Nick D, welcome to the forum.
I don't know what your area is like for nightjars, but from your description I'd guess this could be one of the larger bats,
Noctule perhaps?
HTH
Tursiops2