Final answer:
Public access is most restricted at Wildlife Sanctuaries to ensure the protection of sensitive breeding sites. The CITES agreement is the main international legislation that prohibits the trade of certain endangered species, including parrots.
Step-by-step explanation:
Among various options such as National Park, Game Reserve, Wetland, and Wildlife Sanctuary, public access is typically most restricted at Wildlife Sanctuaries. These areas are often set aside specifically for the conservation of certain species, and to ensure successful breeding, human interference is kept to a minimum. Sanctuaries, as well as other protected areas like marine protected areas, create necessary no-take zones where the extraction of resources is prohibited. This often includes limiting or completely restricting public access to sensitive breeding sites.
In terms of legislation against the trade in certain species, the Convention on International Trade in Endangered Species of Wild Fauna and Flora (CITES) is the primary international agreement that regulates the trade of specific plant and animal species, including parrots. The Endangered Species Act (ESA) is another significant U.S. law that provides for the protection of critically endangered species within the United States but doesn't directly regulate international trade.