What organization monitors international trade in species of conservation concern?

The organization that monitors international trade in species of conservation concern is the Convention on International Trade in Endangered Species of Wild Fauna and Flora (CITES). CITES was established to ensure that international trade does not threaten the survival of species in the wild. It regulates and monitors the trade of endangered plants and animals by providing a framework for parties to create regulations and practices that protect these species. Each member country, known as a party to CITES, is responsible for implementing the provisions of the convention within its jurisdiction to ensure that species listed in it are not overexploited through international trade.

While the US Fish and Wildlife Service plays a role in protecting endangered species within the United States and is involved with the administration of CITES policies domestically, it is not the international body that oversees trade regulations globally. The World Bank primarily focuses on economic development and does not specifically monitor species conservation. The World Wildlife Fund is an organization dedicated to wildlife conservation, but it does not have the regulatory authority that CITES holds regarding international trade in endangered species. Thus, CITES stands out as the correct answer as it directly addresses the complexities of international trade concerning species at risk of extinction.