“John Norris: Vegetarian Testimonial,” video ad for People for the Ethical Treatment of Animals (26 August 2011) https://www.youtube.com/watch?v=9LnCbT3ayvM.
“We can argue about their intelligence (which we would likely define in human-centric terms anyway), their ability to understand human language, or even the extent to which they really understand and know the world around them, but there’s no argument that can convincingly show that animals don’t feel pain, and that they have no interest in avoiding that pain. If anything, animals are more sensitive to the world around them than we are, given their heightened sensory abilities.”
Source: Making a Killing: The Political Economy of Animal Rights (2007), p. 25
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Bob Torres 7
American podcasterRelated quotes

"Shadows of Forgotten Ancestors" (1992) (co-written with Ann Druyan)
Context: Humans — who enslave, castrate, experiment on, and fillet other animals — have had an understandable penchant for pretending animals do not feel pain. A sharp distinction between humans and 'animals' is essential if we are to bend them to our will, make them work for us, wear them, eat them — without any disquieting tinges of guilt or regret. It is unseemly of us, who often behave so unfeelingly toward other animals, to contend that only humans can suffer. The behavior of other animals renders such pretensions specious. They are just too much like us.

Yukihiro Matsumoto " I'm a Mormon, Ruby Author and a World-changer https://youtube.com/watch?v=bkh0gPf4Noc" by ComeUntoChrist.org on 2013-08-12.

Organic and Inorganic
Source: The Note-Books of Samuel Butler (1912), Part VI - Mind and Matter
Source: Making a Killing: The Political Economy of Animal Rights (2007), p. 20

"Making Sense of AIDS" (1985)
The Moronic Inferno and Other Visits to America (1986)

"Every Week There is More Reason to Feel Empathy for Animals" https://www.huffingtonpost.com/ingrid-newkirk/every-week-there-is-more_b_216409.html, Huffington Post, 17 July 2009.
2009

Sweet Morality (p. 224)
The Immortalization Commission: The Strange Quest to Cheat Death (2011)