“The fact that no one has come up with a really convincing reason for giving greater moral weight to members of our own species, simply because they are members of our species, strongly suggests that there is no such reason. Like racism and sexism, speciesism is wrong.”
Source: The Point of View of the Universe: Sidgwick and Contemporary Ethics (2017), p. 343
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Peter Singer 54
Australian philosopher 1946Related quotes

Peter Singer - The Genius of Darwin: The Uncut Interviews - Richard Dawkins https://www.youtube.com/watch?v=GYYNY2oKVWU, 2009.
Source: Practical Ethics
Context: Speciesism is an attitude of prejudice towards beings because they're not members of our species, so just as racism means that you're prejudiced against beings who are not members of your race and sexism means you're prejudiced 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.

" Speciesism Again: The Original Leaflet http://www.veganzetta.org/wp-content/uploads/2013/02/Speciesism-Again-the-original-leaflet-Richard-Ryder.pdf", in Critical Society, Issue 2, Spring 2010.
Axelrod, Robert, and William Donald Hamilton. "The evolution of cooperation." Science 211.4489 (1981): 1390
Interview for InConversation http://www.abc.net.au/rn/inconversation/stories/2007/1998485.htm (16 August 2007), by Robyn Williams, Australian Broadcasting Corporation
Context: One of my complaints is that you've got far more scientists than ever before but the pace of discovery has not increased. Why? Because they're all busy just filling in the details of what they think is the standard story. And the youngsters, the people with different ideas have just as big a fight as ever and normally it takes decades for science to correct itself. But science does correct itself and that's the reason why science is such a glorious thing for our species.

Voices from the Sky : Previews of the Coming Space Age (1967)
1960s