The theory of animal liberation, represented by P.Singer, holds that we should extend the ethical principle of "taking care of the interests of all parties equally" to animals, and we have the obligation to stop our own behaviors that bring pain to animals. The theory of animal rights, represented by T.Regan, holds that the reason why we want to protect animals is that animals, like people, have inviolable rights and have natural values that deserve our respect. This kind of values endows them with a moral right, that is, the right to be respected. This right determines that we can't just use animals as a tool to promote our welfare. Just as we can't treat others like this, we think that the animal rights movement "tries to achieve a series of goals, including: 1, completely abolishing the traditional custom of applying animals to scientific research"; 2. Completely cancel the commercial animal breeding industry; Commercial and recreational hunting and trapping are completely prohibited. "

Biological egalitarianism

Bioegalitarianism advocates extending the scope of moral care to all life, and the representative ideas are P Taylor's view of "respecting nature" and A Schwaetzer's view of "fearing life".

Taylor described the ecosystem as "an alliance of close contact and cooperation between plants and animals". The so-called respect for nature means that all life is regarded as entities with the same natural value and moral status, and they are entitled to equal care and care.

The basic requirements of reverence for life are: reverence for all life will as reverence for one's own life will, and treat all life will living outside oneself with sympathy. Only when a person regards all life as sacred, animals and plants as his own compatriots, and tries his best to help all life in need, can he be moral. It is believed that in the course of life, a person does occasionally kill other lives, but it must be to promote another life and have a sense of responsibility and sympathy for the sacrificed life.