Barn owls are highly susceptible to secondary rodenticide poisoning, and campaigns for restrictions on second-generation anticoagulants are gaining traction.
Barn owls poisoned by secondary SGAR exposure die from internal haemorrhage over days to weeks, experiencing progressive weakness and inability to fly. Sub-lethal exposure impairs hunting and reproductive success. The welfare impact extends beyond individuals to populations as SGAR exposure reduces breeding success across landscapes with widespread rodenticide use.