Gary Steiner quotes:

Not only are animals unable to avail themselves of language to assert their own rights, but many fewer humans have a clear sense of kinship with animals than have a clear sense of kinship with other humans. Among beings with subjective states of awareness, animals are the untouchable caste, those whom human others would rather not acknowledge, let alone render assistance.

Human beings have capitalized on the silence of animals, just as certain human beings have historically imposed silence on certain other human beings by denying slaves the right to literacy, denying women the right to own property, and denying both the right to vote.

To be ethical is to endeavor to find one's proper place in the larger scheme of things rather than to seek to assert human superiority over the natural world.