NLRG was formed in 1957 to help in the study of birds in the Lancaster and District Birdwatching Society area. There are currently 12 active ringers. Species currently being studied include: Pied Flycatcher, Bearded Tit, Sand Martin, Twite, Goosander, Oystercatcher and Grey Wagtail. Migration has been studied for 28 years at Heysham. We welcome anyone who wants to observe, help or perhaps wish to become a ringer. Photo: A Heysham-ringed Twite on the Mull of Kintyre (thanks to Eddie Maguire)

Saturday, 20 November 2010

Cetti's Warbler - The Mystery Deepens!

Cetti's Warbler have not as yet been proved to breed in North Lancashire. The first record was one ringed at Leighton Moss in October 1995. Singles were also caught there in the autumns of 2007 and 2008. This increased to four in the autumn/winter of 2009/2010.

At least two males were singing throughout March 2010 but the last one was heard on April 3rd. However this autumn has been outstanding for between September 18th and mid October we have caught six birds. Of these four were newly ringed and two were re-traps from previous autumns. One from September 2008 and the other from October 2009.

So are these two birds returning winter visitors? Or did they breed undetected and the four newly ringed birds are locally bred. Certainly there are many suitable areas difficult of access on the Moss where they could have bred undetected. However one would perhaps have expected us to catch young birds earlier in the season.

No comments: