Prof. Esther Turnhout of the Forest and Nature Conservation Policy Group of Wageningen University delivered the annual Geographies of Knowledge Lecture at Cambridge University, UK, on 10 May 2018. Entitled 'Spaces of Biodiversity Expertise', the lecture explored different sites of biodiversity expertise. Prof. Turnhout discussed the different logics that shape the production of expertise in these sites and reflected on the implications for how we understand and govern biodiversity. She explored a number of sites where biodiversity expertise is produced. These include examples in the Netherlands. She drew on her experiences as an expert and lead author for the Intergovernmental Platform for Biodiversity and Ecosystem Services (IPBES). Particular focus was given to two interrelated logics that are prominent in biodiversity expertise: that of policy relevance and that of assessment. Her argument is that these two logics together prioritise model projections over other forms of expertise. The lecture concludes by discussing the scope for doing things differently and breaking through dominant logics.