We are the living. We find ourselves in a mess that is sometimes called the 'Anthropocene'. This is a mess that has been hidden, ignored, neglected through a narrative of progress, consumption, linearity, categorisation, control, prosperity, rationality. To respond to this narrative, we employ 'mess-making' as a force for resistance. We rethink our more-than-human relations by concepting with mess to invigorate, agitate and provoke. Employing Haraway's (2008) 'messmates', we conceptualise how 'we' as ecosystems of thriving life forms are constantly living, learning and dying together and need to find new ways to co-research with/in/for more-than-human methodologies. These, we suggest, are inherently messy. The paper is organised in a nonconventional way in that it is mostly created by more-than-human narratives gathered from two doctoral post-qualitative inquiries exploring play in an urban forest school in London and animal-child relations in a wall-less school in Bali. We explore how mess-making is both generative and challenging as data emerge in dynamic and exciting ways. With this messy turn, we illuminate potential for educational futures that support multispecies flourishing.