This book develops a theory of political animal voices in three steps. The first part focuses on language. Drawing on insights from recent studies in biology and ethology, it challenges a view of language as exclusively human and argues that other animals speak. It also investigates the relation between developing common languages and creating common interspecies worlds. The second part of this book focuses on interspecies politics; it challenges an anthropocentric demarcation of the political and develops an alternative, which takes into account non-human animal agency and interspecies political relations. The third and final part of the book draws on the insights about language and politics developed in the first two parts to investigate how existing political practices and institutions can be extended to incorporate non-human animal political voices, and to explore new ways of interacting with other animals politically. In addition to the theoretical chapters, the author discusses two case studies. In the first, she draws on her experiences of learning how to live with a stray dog from Romania. In the second, she focuses on the goose-human conflict in the Netherlands.