A threatened bird, the chimney swift, only stops flying to land on vertical perches inside hollow trees, chimneys of old buildings, abandoned wells, grain silos, air shafts, barns, sheds and derelict houses.
The population is threatened due to habitat loss. Interesting as so much of their habitat has adapted to live alongside people. There are many animals living in urban environments but I hadn’t heard of the chimney swifts before.