Researchers Joseph and Charles Vacanti grew a human "ear" seeded from implanted cow cartilage cells on the back of a living mouse to explore the possibility of fabricating body parts for plastic and reconstructive surgery.
People in the United States eat 9 billion chickens and 150 million cattle, pigs and sheep annually, and we use around 26 million animals for research, 95% of which are rodents, birds and fish.
95% of animals used in experiments are not protected by the federal Animal Welfare Act (AWA), which excludes birds, rats and mice bred for research, and cold-blooded animals such as reptiles and most fish.
The US Food and Drug Administration endorses the use of animal tests on cosmetics to "assure the safety of a product or ingredient." American women use an average of 12 personal care products per day.