Is the tick a machine or a machine operator? Is it a mere object or a subject? With these questions, the pioneering biophilosopher Jakob von Uexku ll embarks on a remarkable exploration of the unique social and physical environments that individual animal species, as well as individuals within species, build and inhabit. This concept of the umwelt has become enormously important within posthumanist philosophy, influencing such figures as Heidegger, Merleau-Ponty, Deleuze and Guattari, and, most recently, Giorgio Agamben, who has called Uexku ll ""a high point of modern antihumanism."" A key docu