I've used call playback at various times over the years often with
photography in mind. I've made the following observations:
Some birds respond only briefly some make a determined search for the
intruder and others just ignore it, including species I would expect to
respond.
I also recall seeing posts saying " such and such a bird doesn't respond
to the BOCA tape" implying that the bird can recognise a particular
recorded call and choose to ignore it.
I too have often seen birds feed in response to a call as if to say this
is my area, look I'm using it. I wonder if the response responds to
where in their territory the bird is. If it's on the edge of what it
recognises as its territory it might think it's being chastised by a
neighbouring owner and leave or if it's hungry it might continue feeding
rather than respond. I'm of the school of thought that judicious use of
calls does little harm. In fact as others have said it can be counter
productive and cause the bird to "satellite" or otherwise become move
around making a photo a very distant possibility. Individual birds seem
to vary quite widely in how they will respond.
Chris Ross
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