Every year, in the shed above a window, a pair of reddish-tailed songbirds nest. When they have young they make it clear with a sharp ‘tweet tweet’ sound that you are not welcome. Which bird is it?
Asker: Fritz, 61 years old

Answer
Hi Frits,
It is probably a black redstart that breeds with you.
Answered by
Sharon Eeckhout
Biology
university of Ghent
http://www.ugent.be
.