redshift
Toad Popper
Fife: Vane Farm RSPB up on the hill, bare birch tree, last week. A distinctive whistled repetitive "low-hi-hi-hi-low-hi-hi-hi-low-hi", then a pause and then repeated. Went on for a couple of minutes, I circled the tree but was completely unable to find the bird! Any ideas? I recognise basic calls only, this was "different".