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We have probably all heard about threatened species that are close to extinction, but how do we measure this? Monni travels to the IUCN Red List Unit in Cambridge to find out about the ins and outs of the IUCN Red List of Threatened Species, the world’s most comprehensive inventory of the extinction risk of species. How do we measure extinction risk? Who compiles the Red List and why? Which species have been assessed, what data do we need and where are the main data gaps? And what has Frank Zappa got to do with it all? Find out more about this flagship conservation tool and the people who eat, sleep and breathe the IUCN Red List.