“Humans — who enslave, castrate, experiment on, and fillet other animals — have had an understandable penchant for pretending animals do not feel pain.”
"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.
Help us to complete the source, original and additional information
Carl Sagan 365
American astrophysicist, cosmologist, author and science ed… 1934–1996Related quotes
“John Norris: Vegetarian Testimonial,” video ad for People for the Ethical Treatment of Animals (26 August 2011) https://www.youtube.com/watch?v=9LnCbT3ayvM.
Source: Against a Scientific Justification of Animal Experiments, pp. 345-346
Source: Making a Killing: The Political Economy of Animal Rights (2007), p. 25

"Does God Exist?" debate vs Stephen Law, Westminster Central Hall, London, , quoted in * 2012-10-04
William Lane Craig argues that animals can’t feel pain
Jerry
Coyne
Jerry Coyne
Why Evolution Is True
http://whyevolutionistrue.wordpress.com/2012/10/04/william-lane-craig-argues-that-animals-cant-feel-pain/
2013-03-07

The Tragic Sense of Life (1913), I : The Man of Flesh and Bone
Context: Man is said to be a reasoning animal. I do not know why he has not been defined as an affective or feeling animal. Perhaps that which differentiates him from other animals is feeling rather than reason. More often I have seen a cat reason than laugh or weep. Perhaps it weeps or laughs inwardly — but then perhaps, also inwardly, the crab resolves equations of the second degree.

Introduction, p. 4
A Plea for the Animals (2014)

respect.
" Notebook B http://darwin-online.org.uk/EditorialIntroductions/vanWyhe_notebooks.html" (1837-1838) page 231 http://darwin-online.org.uk/content/frameset?pageseq=233&itemID=CUL-DAR121.-&viewtype=side
quoted in [2009, Darwin's Sacred Cause: How a Hatred of Slavery Shaped Darwin's Views on Human Evolution, Adrian Desmond & James Moore, New York, Houghton Mifflin Harcourt, 9780547055268, 23042290M, 115, http://books.google.com/books?id=V9cGkBj_8iYC&pg=PA115&dq="Animals+whom+we+have+made+our+slaves"]
Other letters, notebooks, journal articles, recollected statements

"Do Animals Have Beliefs?" (1979); as quoted in The Case for Animal Rights by Tom Regan (University of California Press, 2004), p. 36 https://books.google.it/books?id=Y0tWjRmxFE4C&pg=PA36.
Masterplan: Judaism, Its Program, Meanings and Goals (Jerusalem: Feldheim, 1991), pp. 68 https://books.google.it/books?id=uQxdgZikdCcC&pg=PA68-69.