Conversely the use of animals is seen by many in the medical field as necessary. While it is not ideal to cause harm to animals it is a safer way to test new products compared to testing them on humans. Typical research and development will begin trials on rats. If those tests prove successful then another set of tests are conducted on monkeys. Once the tests are successful with monkeys then human testing begins. These tiered rounds of testing are used to reduce the amount of mistakes and negative side effects in all breakthroughs. It is argued that animal testing saves many lives and there is no alternative to testing on a living organism. In addition there are strict regulations for animal testing which prevent any mistreatment of the animals in question.