Animal experimentation or testing is the use of non-human animals in experiments. The research is conducted inside universities, medical schools, pharmaceutical companies, farms, defense establishments, and commercial facilities. The torturing and sacrificing of animals is what goes on in hidden laboratories in research facilities every day. Each year, more than 100 million animals are killed in the U.S., including mice, rats, frogs, dogs, cats, rabbits, hamsters, guinea pigs, monkeys, fish, and birds. The truth is that animal experimentation is not required to advance human medical science in modern society. Since humans respond significantly different than other animals, using non-human animals to test on is unreliable at best, and fatally dangerous at worst, for humans.