Monday, 18 October 2010

One for the anoraks!

Well I did promise some 'tristis' recordings, and after a good bit of head scratching, and some consulting with the 'guru' of all such things Magnus Robb (cheers once again!), I can give you the following...

Siberian Chiffchaff ('tristis')

The reason for the 'head scratching' was the variety of calls this bird was giving. The typical 'tristis' call is described in 'Collins' as a "piping, straight (or negligibly downslurred) 'hii(e)p'... ". This call was given by this bird, but it also varied the call with some deviations, including a slight upward inflection in the middle of some calls! And quite a few calls with the downslurred ending mentioned in the 'Collins' guide. I know these birds are still a bit of a 'work in progress', and I wanted to make sure I wasn't missing out on any new info. As I believe the 'tristis' bird to be a first winter bird, I've included the calls of a young 'collybita' bird raised in Shetland this year as a comparison. As you can hear they do sound very different, with the local bird, the calls all have a smooth upward inflection as expected...

Common Chiffchaff ('collybita')

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