Lifer!!! (but not sure what species) I am thinking Golden-winged Warbler though.
We found this right above one of our tents in Mahoora Tent Camp near Wilpattu during the Quest Nature Tour I was leading. Seen by Graham and Sharon Nancekivell and myself. We heard it do a high pitched call first. It was surprisingly fast as it scrabbled through the branches. Probably my favourite sighting of the trip!