ABSTRACT Indigenous Peoples are key knowledge holders and essential partners to confront global environmental crises, especially biodiversity loss. Many calls have been made to better integrate Indigenous Traditional Ecological Knowledge and Western ecological sciences. However, partnerships between these communities are complex due to power imbalances, distrust, different objectives, and injustices towards Indigenous Peoples. This raises the question of what meaningful engagement is, and for whom. These issues were discussed at a scientific workshop in Conguillío National Park, Chile. This initial encounter between ecologists and Mapuche elders, including a Machi (a Mapuche spiritual authority), has led to ongoing dialog and engagement. Responding to calls to listen deeply towards engagement with Indigenous Peoples in Western ecological sciences, we—the Machi and scientists—present our joint perspectives and reflections upon the process, drawing from Indigenous Knowledge and Western ecological sciences. Interweaving both lived experiences and scientific evidence, we document the environmental issues confronting the local Mapuche community caused by industrial developments in the territory. Our joint account highlights conflicts caused by non‐native tree plantations and the plans to construct a hydroelectric plant in the Truful–Truful watershed, which was opposed strongly by the local communities. Together with the industrial forestry plantations that cause land‐use change, the construction of this hydroelectric plant endangers biodiversity, including species of conservation significance, medicinal plants, and ultimately, the Mapuche way of life. Reflecting upon our collaboration and the process facilitated by Two‐Eyed Seeing, we illustrate that Indigenous voices and scientific evidence, together, can deepen our understanding of social‐ecological change in the territory and reveal opportunities for building trust and relationships. We highlight the importance of time, preparation for engagement, and advocating for change in knowledge partnerships in the ecological sciences. Learning from our collaboration, we call upon our communities to continue listening, engaging, and advocating for Indigenous representation in ecology.