The modern concept of extinction emerged in the Victorian period, though its chief proponent is seldom remembered today. Alfred Newton, for four decades the professor of zoology and comparative anatomy at Cambridge, was an expert on rare and extinct birds as well as on what he called ‘the exterminating process'. Combining traditional comparative morphology with Darwinian natural selection, Newton developed a particular sense of extinction that helped to shape contemporary, and subsequent, animal protection. Because he understood extinction as a process (...) to be studied scientifically, and because he made that, rather than animal cruelty, the focus of animal protection, Newton provides an important window onto the relationship between science and sentiment in this period. Newton's efforts to bring the two into line around the issue of human-caused extinction reveal an important moment in which the boundaries between science and sentiment, and between those who did and those who did not have the authority to speak for nature, were up for grabs. (shrink)