Settler Ecologies tells the story of how settler colonialism becomes memorialized and lives on through ecological relations. Drawing on eight years of research in Laikipia, Kenya, Charis Enns and Brock Bersaglio use immersive methods to reveal how animals and plants can be enrolled in the reproduction of settler colonialism. The book details how ecological relations have been unmade and remade to enable settler colonialism to endure as a structure in this part of Kenya. It describes five modes of violent ecological transformation used to prolong structures of settler colonialism: eliminating undesired species; rewilding landscapes with species desirable to settler ecologists; repeopling nature to create seemingly more inclusive ecologies and capitalize on biocultural diversity; rescuing injured animals and endangered species to shore up support for settler ecologies; and extending settler ecologies through landscape approaches to conservation that scale wild spaces. Settler Ecologies serves as a cautionary tale for future conservation agendas in all settler colonies. While urgent action is needed to halt global biodiversity loss, this book underscores the need to continually question whether the types of nature being preserved advance settler colonial structures or create conditions in which ecologies can otherwise be (re)made and flourish.