This article introduces biomimicry as an approach to STEM learning with a strong real-world application. It provides an introduction to biomimicry itself and some of the key principles behind using biomimicry as an approach to design. It draws upon almost three years of work within the BioLearn project, which is working with secondary schools in five countries to bring biomimicry into the school curriculum. Piloting in schools is demonstrating that using biomimicry can enhance the teaching of STEM subjects and provide strong links with sustainability issues and future careers.