I have listened to so many and I just can't seem to match it up. I wondered about the nightingale too as there are some close to here, but I think its a warbler tbh.
I am reliably told that it's a Marsh Warbler. The reason that it was hard to identify is because they mimic other birds they hear also those from their travels in Africa. Interesting.
Definitely a Marsh Warbler, they are very vocally variable and can mimic other bird species quite convincingly. Just to add that I'm not sure of the status in Belgium but they are extremely scarce in the UK. When I started birding 30 years ago there were a few known and protected breeding sites where they could be seen, primarily Eckington Bridge in Worcs but that's long abandoned. They can turn up on passage in spring when a singing bird can usually be identified by it's song and more often in autumn but identification of non singing adults or immatures can be very tricky. I used to be part of the committee that confirmed sightings of rare and scarce birds for the Cheshire and Wirral Ornithological Society and I don't remember accepting a single one. A very beautiful song Luv Dave
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Once, i had a black redstart in the old open shed, definitely passing through but nice to see. Hung around a while so i was able to id it that time.
Just to add that I'm not sure of the status in Belgium but they are extremely scarce in the UK. When I started birding 30 years ago there were a few known and protected breeding sites where they could be seen, primarily Eckington Bridge in Worcs but that's long abandoned. They can turn up on passage in spring when a singing bird can usually be identified by it's song and more often in autumn but identification of non singing adults or immatures can be very tricky. I used to be part of the committee that confirmed sightings of rare and scarce birds for the Cheshire and Wirral Ornithological Society and I don't remember accepting a single one.
A very beautiful song
Luv Dave