…when we removed the body (of his cagemate) to the operation 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.

I believe I am not interested to know whether vivisection produces results that are profitable to the human race or doesn’t. To know that the results are profitable to the race would not remove my hostility to it. The pains which it inflicts upon unconsenting animals is the basis of my enmity toward it, and it is to me sufficient justification of enmity without looking further.

Not only are these animals new to science, but they're adapted to very specific environments – some of them, to a single room in one cave.

Vivisection is a social evil because if it advances human knowledge, it does so at the expense of human character.

I work on the floor with them. Lab coats scare them, so for the animals, it's better to wear regular clothes.

The results of this animal trial are very promising, not only because our vaccine completely protected animals that otherwise would have died, but also because we found that one form of the vaccine stimulates several lines of immunity against H5N1.