Monday, 5 September 2016

Arctic Warbler (1)

I guess that posts with nobbut photos of stints are now going to be replaced by posts with nobbut photos of Arctic Warblers Phylloscopus borealis! I got at least one nice showy one of these in my woodlot this morning, calling with a rather high-pitched Dipper-like 'zik'. It does make sense that more northerly-distributed birds would pass through first, and a sonogram analysis of perhaps this individual from a recording made the previous day showed it to be calling with a single call note within the range of Arctic Warbler (from around 5500-7000 Hz), too high for Japanese Leaf Warbler Phylloscopus xanthodryas and absent the 'multi-note' rasp of Kamchatka Leaf Warbler Phylloscopus examinandus (which comes later). I had previously assumed on range and on a misleading sound recording heard somewhere online that Japanese Leaf Warbler would predominate in Taiwan. However, repeated 'sampling' of both passage and wintering birds has revealed that they are quite overwhelmingly Arctic Warblers. 

These guys usually bring with them a bit more variety, so I am looking forward to a lot more of them showing up. Above photos taken in Qi Gu, Tainan County 5/9/16.

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