A strange song was heard the other morning. It was a kingfisher! He was sitting on the roof of the next block singing loudly for quite a long time. I could hear another kingfisher a bit further away replying to him.
The high-pitched 'tri-li-li-li-li' or trilling sound you hear is the Kingfisher. The other 'screp screp' noises are made by Common Mynahs (I think!).