Speciesism is an attitude of prejudice towards beings because they're not members of our species, so just as racism means that you're prejudice against beings who are not members of your race and sexism means you're prejudice against people of the other sex. So we humans tend to be speciesist in we think that any being that is a member of the species homo sapien just automatically has a higher moral status and is more important than any being that is a member of any other species, irrespective of the actual characteristics of those beings.

Peter Singer - The Genius of Darwin: The Uncut Interviews - Richard Dawkins, 2009.

Peter Singer - The Genius of Darwin: The Uncut Interviews - Richard Dawkins