Blog extract courtesy of Ian Lewis http://gryllosblog.wordpress.com/
By far the most exciting birding of the week occurred on the 19th. Shaun and I were planning to ring at Durlston, thinking it was going to be too windy we changed our mind. Mick Cook who lives near Durlston had a go, but ringed just a single Blackcap in three hours! Shaun and I, now joined by Paul Morton set up at PC World drain, our inter Chiffchaff site. This site is well named, it is the unpleasant, somewhat odorous outflow from Poole sewage works that runs from the Broadstone relief road to Holes Bay behind PC World store.
This site is bordered by a strip of scrub sandwiched in-between the Upton by-pass and the Fleets Corner retail park, has earned a reputation as a good place to see Chiffchaffs in winter. Recently the occurrence of one or more ‘Siberian’ Chiffchaffs in winter has brought the place to wider recognition. In 2009 we obtained permission to ring there. Our idea was to examine the extent and site fidelity of wintering Chiffchaffs and we have succeeded in proving the latter twice. we continued the wintering Chiff study into late March this year when we caught a stunning 68 Chiffs. It was now clear that Chiffs used this strip of green as migration corridor as well as a wintering site. Further observations in April showed that Willow Warblers were also using the site but nothing could prepare us for the numbers seen on the 19th.
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| Common Whitethroat |
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| Garden Warbler by Ian Lewis |
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| Grasshopper Warbler by Ian Lewis |
We ringed a total of 37 Willows, 7 Chiffs, 19 Blackcaps, 8 Common Whitethroats with single Goldcrest, Garden, Sedge and Grasshopper Warblers plus a small number of resident species, 81 birds altogether.
But the real surprise occurred about 1030. Shaun had now left for work, Paul and I were discussing what birds we could encounter there in the future. I was trying to curb his enthusiasm in expecting Nightingale or other scarce migrants when he said Subalpine Warbler. From the tone of his voice I could tell it wasn’t a prediction but a reality. I got onto the bird as it flew right and though I’d lost it but it came back and perched up for a couple of seconds. Fantastic! This is the first record of this sub-rarity for the Poole Harbour area although I have seen three previously in Dorset. A small crowd soon gathered, some having rushed from work (indeed one couple left some 40 business associates to have a ‘coffee break’ whilst they twitched it), we remained until about 1500 and some stayed even longer but unfortunately it was never seen again
Why this small area should be so full of migrants when Portland, Durston and other migrant hotspots had next to nothing is a mystery. In spite of all the theories, the sheer unpredictability of birding is what makes it such a fascination hobby. Shaun, Kevin and I had another go at ‘the drain’ on the 20th but all the birds had moved on and we only ringed four Blackcaps and a Whitethroat.
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