Article about an interesting sighting of a bird behaviour, made by me recently.A pair of Ceylon Whistling - thrush/ Arrenga had built a nest in a man made habitat in Horton Plains national park on March, 2016. The site was an abandoned building inside the park and the nest had been built in it. The species is an endemic, endangered, illusive and very shy bird that is heard more than seen. It is very strange that a nest being built on such an artificial habitat. Finding a nest even in it's usual natural nesting habitat is occasional, having only few records.