The Animal Welfare Act was signed into law in 1966. It is the only Federal law that regulates the treatment of animals in a variety of settings from research laboratories to zoos and circuses. In 2002, the Act was amended to remove from protection several species of animals used in laboratory experiments, including rats, mice, and birds. These species make up approximately 95 percent of all animals used in biomedical research laboratories. Recently, HR 6693 was introduced to amend the Animal Welfare Act to provide for the protection of birds, rats, and mice, and for other purposes.