Using the BTO’s ring-recovery database we have been able to analyse dispersal movements, with the aim of providing insight into Barn Owl movements in the UK. The results of this work suggest that new, high-quality habitat aimed at mitigating negative effects of HS2 on Barn Owls should be located between 3 km and 15 km away from the railway route, depending on the importance placed on minimising juvenile, as opposed to adult, mortality.