This work has dealt with three plays of the Irish woman playwright Marina Carr. "Portia Coughlan", "By the Bog of Cats" and "Woman and Scarecrow" is here related to the topic of beasts, be it through human language, an animal context or as in a concrete figure. The whole work has a Derridean perspective as its theoretical tool. Jacques Derrida who is famous for the invention of deconstruction also developed in his later years an ethic around animals and how we humans should engage in our relationship with all kinds of beasts. In the prolongation of that, as Derrida is read in this text, humanity must admit the animal also in man as a defined force for our culture.