Peter Singer is an animal-rights activist and professor at Princeton who also believes that it is reasonable for healthcare providers to kill mentally disabled babies. He strongly questions the personhood given to any unborn child and finds little similarity to killing an unborn child and killing any other person. However, Singer believes that all rights, including the right to life, should be granted to animals. Singer simultaneously advocates for the right to life for animals and the right to abort the unborn child. Singer believes children should be able to be aborted up to 2 years old.