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    • Or use two coat hangers, both bent at 90° as divining rods to locate the sound and fresh water too 😄 
    • Most of the above but, as mentioned, blackbirds are much rarer. Cats without bells on collars are a scourge and menace, maim and kill so many birds (and mammals, amphibians)…
    • That seems more like the initial reports, where the beeping appears to be clearly heard but difficult to locate.   I don't know what experiments would then be useful.  I'd suggest something like: go to the area at night when there's little other noise.  Have with you any of (a) a stout tube -- apply to one ear, block the other; (b)  some electronic recording or audio-sampling device(s).  In both cases they could be used in different locations and/or orientations (principally rotation about a vertical axis), with a view to finding variations in perceived or received intensity.   Maybe take someone with you to video the proceedings. 🙂
    • Agree, the merlin app is really useful, especially if you are bird spotting somewhere like Greendale where it's much easier to hear birds than see them! Once you've learnt a call you can look out for the bird... Sue – I saw a pair of long tailed tits in East Dulwich Grove yesterday : )
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