What can architectural and urban practice learn from places where biodiversity and collective life are negotiated together? Michele Porcelluzzi presents his recently completed doctoral research, jointly developed at Politecnico di Milano (DAStU) and ETH Zürich (D-ARCH, NEWROPE Chair of Architecture and Urban Transformation). The work investigates a series of urban places where ecological processes and collaborative practices shape each other. It is based on extended fieldwork across five European sites: Floating University in Berlin, De Ceuvel in Amsterdam, ASIAT Park in Vilvoorde, Krater in Ljubljana and Stadionbrache Hardturm in Zürich. Rather than treating biodiversity as a mere technical concern, the research asks how architecture can engage with the social and political life of these