Christian Barnard

"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."
~ Christian Barnard, Surgeon ~