Man is able to assume a dominant role in nature due to his intelligence and his adaptability. The ability to create his environment according to his ideas might lead to adverse conditions for others. The hunting of animals on account of the gain of resources, food or other purposes can cause the extinction of an existing species. In order to exemplify this, this thesis deals with the international set of rules designed for the regulation of whaling. As an introduction, the history, the scale as well as the practice of whaling are explained. Subsequently, an outline of the right of protection of species of international law, the description of the recent treaty for the protection of endangered species, and the problematic nature of deep-sea fishing with regard to the international law are elucidated. The main part of the thesis deals is concerned with the international set of rules for whaling. After the outline of the international consent on the regulation of whaling (ICRW) and the international whaling committee (IWC), the whaling moratorium and the related special provisions are elaborated. Furthermore, the IWC is compared with the North Atlantic Marine Marmal Commission (NAMMCO), an international but regionally operating organization dealing with similar matters. The presentation of other treaties for the protection of endangered species concerning whaling and their legal relation to the ICRW follows. The concluding part is dedicated to the efforts of NGOs in this field. In doing so, different organizations, their campaigns for the preservation of whales, which pressurize nations practicing whaling and contribute substantially to this environmental issue, are outlined and presented.