- #837 Dear BTO - part 2 20.9.2021
- https://www.hampshireswifts.co.uk/post/dear-bto-part-2
- "providing Swift boxes/Swift bricks can, in time, greatly enhance a population which would have either gone extinct or simply not have existed at all. -- More importantly I know of no sites where we have installed Swift boxes where the number of Swifts is declining rather than increasing."
- tervapääsky pönttö rakennus suojelu
http://kaupunkilinnut.fi/?links&linkid=837