In August 2020, with funding from Birds on the Brink, Hampshire Swifts installed 20 nest boxes for swifts in the Bell Tower of the Cathedral.
Visitors may notice the call attraction system which was installed which plays a compilation of duets given by a breeding pair of swifts defending its nest place from other swifts. Swifts searching for a place to nest are attracted by these duets as they hope there might be room for them to nest at the same site. The call attraction system is set up to play calls three times a day (early morning, midday and evening) to coincide with periods when swifts are more likely to be looking for nest sites. Soon after the calls were switched on in May 2021, we saw swifts investigating the openings in the tower that lead into the nest boxes.