The rewilder and the ecologist discuss the rival demands of reintroducing extinct species and of managing invasive ones. Britain’s favourite maverick rewilder Gow (Bringing Back the Beaver) has played a significant role in the reintroduction of the Eurasian beaver, the water vole and the white stork in England. He’s currently working on a reintroduction project for the wildcat, and in Hunt for the Shadow Wolf makes the case for the return of the wolf. Ecologist and environmental writer Warwick is well-known for his role as spokesperson for the British Hedgehog Preservation Society. In Cull of the Wild he investigates the ethical and practical challenges of one of the greatest threats to biodiversity: invasive species, which the UN Convention on Biological Diversity ranks as a major threat on a par with habitat loss, climate change and pollution. In conversation with Nicola Cutcher, investigative journalist, documentary maker, and freelance writer.