can anyone explain or report similar regarding the mixed singing Willow Warbler/ Chiffchaff in Alexandra park this week?
see notes at the top of Friday 6th April's entry
I remember hearing exactly this sort of thing from a single bird many years ago in Edinburgh. However, the passage of several decades has erased any memory of the explanation.
recording wildlife with The Recorder's Year on www.hbrg.org.uk/TRY.html.
There have been a small number of these in the London area in recent years. I think I've seen some suggestions that they might be hybrids but I don't know if this was on the basis of anything other than the mixed call.
Will try to check back through some old London Bird Reports when I have a spare moment and see what is reported about them.