Together with Jörg Gleiter, Hartmut Böhme, Eric-Jan Pleijster, Heike Hanada, Sophie Kimmig, Gernot Weckherlin, Thomas Hauck & Wolfgang Weisser and Michele Porcelluzzi Mathias contributed to the thematic magazin by Bund Deutscher Architektinnen und Architekten (BDA) in March 2023. Entitled ‘The urban habitat’ (OSSN 0003+875X) Mathias elaborates in his article about the lessons learned in the past 10 years of his work with nextcity.nl, and what can be hands-on strategies to employ in all architectural and urban projects to create benefits for biodiversity, nature in the city and quality of life for all species. The article was conceptualized with Mathias’ nextcity partner Maike van Stiphout.