"A society remotely worth its salt eventually has to come to grips with the barbarism practiced upon helpless creatures in the name of scientific experimentation, tastier/tenderer meat, or more and larger eggs!"

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It's not that humans and non-humans are identical... but the lack of understanding that led to the slave trade is the same lack of understanding many people have about animals today. When slaves were brought over from Africa, many people believed they were not humans, that they didn't have feelings. Many people believe that primates and other animals don't have feelings, too, but they do.

— Jane Goodall