In the early 1900s it was quite fashionable to wear feathered hats. Formal social events were even said to be like aviaries due to the number of women wearing bird trimmed hats. Then in 1918 the Migratory Bird Treaty Act was passed between Canada and the United States making it illegal to pursue, hunt, take, capture, kill or sell migratory birds. This act grants full protection to any bird parts including feathers, eggs and nests. Over 800 species are currently on the list. Many other protective measures have been in acted since the early 1900s including the most notable Endangered Species Act of 1973 which protects all plant, mammal, reptile, bird and amphibians species who are on the verge of extinction.