"I had bought two male chimps from a primate colony in Holland. They
lived next to each other in separate cages for several months before I
used one as a [heart] donor.
When we put him to sleep in his cage in preparation for the
operation, he chattered and cried incessantly. We attached no
significance to this, but it must have made a great impression on his
companion, for when we removed the body to the operating room, the other
chimp wept bitterly and was inconsolable for days. The incident made a
deep impression on me.
I vowed never again to experiment with such sensitive creatures."
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