A note on bird calls and geography.
When in the Pub on St Agnes recently, I noticed 'tirillee-eep' written on a page of my notebook - just that, nothing else and I recalled that I had written it down a moment after I heard the bird at Heathfield GP last year. However with the St Davids bird, and I'm writing this just hours later, the call is clearly fixed in my head as a softer 'toolloolee'. I know that transcribing bird calls is notoriously difficult and calls can vary slightly but I think there may also be a geographical reason for the difference.
It was the same call with the same syllables but I felt the bird today sounded slightly softer in tone. I think the reason is that the wide open spaces on the headland soften and dissipate some of the clarity of the call, whereas at Heathfield (a more enclosed inland site) the acoustics differ and the call seems a little clearer and sharper. The same thing seems to happen with Grey Wagtails, to give another example, the familiar piercing call, here around the garden can seem momentarily unfamiliar, more diffuse, when heard on a bird over-flying the open geography of The Head. Its something I think I need to check out more in future to see if it holds true.