But I thought it would be best to go visit and learn from the most vociferous and vigilant critics we had at that time, which were Henry Spira, head of Animal Rights International, and Peter Singer, who wrote the book "Animal Liberation," which is considered the modern treatise about animal rights.
Mas pensei que seria melhor conhecê-los e aprender com os críticos mais ferozes e vigilantes que tínhamos naquele tempo, que eram Henry Spira, chefe da Animal Rights International, e Peter Singer, que escreveu o livro "Libertação Animal", considerado o tratado moderno sobre os direitos dos animais.