Mystery sound - could you help me?

[Phil Schr=F6ter <>]

Hi Everyone,

This morning I recorded near a lake.
A group of mute swans flow around there but I noticed another screaming
sound which seems to come from those mute swans.
But i'm not sure if this is a call of one of them or another species. pleas=
e
check out this website, listen to my recording and try to find out if this
scream comes from a mute swan or from another bird species:
http://www.naturesongs.com/recordists/mysteryscream.mp3

thanks a lot for your help

PS. Sorry for that bad quality but it wasn't possible to get such near to
the birds. I filtered out the low frequences.

Phil



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