Invasive species play a key role in 60% of plant and animal extinctions, constituting a serious threat to global biodiversity and costing over $423 billion annually. But what is at stake in the impulse to frame a species as "invasive"? What modes of watching, tracking, and surveilling emerge in the context of invasive species management? What are the material and ethical implications of these practices? As the cost of invasive species management has quadrupled every decade since 1970 and is likely to continue to increase, what alternatives exist? Reading through the lens of feminist science studies, this course asks what species movement might teach us about the possibilities and challenges of multispecies environmental ethics. Students will examine theoretical, historical, cultural, and practice-based accounts to better understand how our collective and individual actions continue to unevenly shape the biodiversity of our changing planet.