In a controversial move, Network Rail has blocked three swift nesting holes during the £7.5 million refurbishment of the 160-year-old viaduct in Chapel Milton, Derbyshire. Nature advocates are alarmed, stating that blocking these holes could hinder the breeding of swifts, which have seen a 66% decline in population since 1995. Despite Network Rail's claims of consulting ecologists and creating exclusion zones during the renovation, campaigners argue that evidence of nesting sites was provided to the organization prior to the work. Bird lovers are planning a vigil beneath the viaduct to raise awareness and hope for the unblocking of the holes before swifts return to breed in late April. The swift population's decline is attributed to the loss of nesting sites, and campaigners are advocating for more protective measures for these birds, including the installation of swift bricks in new constructions.