I use to take my breakfast at Train terminal after sending my daughter to work and just infront of it is the National Mosque. This terminal is converted into tuckshop which the train service cease for time being until new train railway for new train which under development is completed. There, at Mosque pillar, these birds are nestings and hovering and flying around near the speaker pillar to capture small insects in the air every morning. Since this bird still not in my list of bird, I went to the mosque to take pictures of them. Happy birding.
Nests are paste on these walls of speaker pillar.