More than forty years after its invention, the notion of speciesism finally escapes from the departments of philosophy to integrate into public debate. What a celebration for animals! However, in order to avoid confusion, focus will only be given to arguments that have already proven themselves. In this presentation, François Jaquet will therefore make an inventory of research in animal ethics. After presenting the issues related to the definition of speciesism, he will explain how speciesism is morally reprehensible.