Charles Darwin's On the Origin of Species was published on November 24, 1859 in London, priced at fifteen shillings. One hundred and fifty years later, evolutionary theory continues to inform biological thinking, leading to enlightening and astonishing new discoveries. From marmots and sabertooth cats to domestic dogs, three distinguished faculty of UCLA's Department of Ecology and Evolutionary Biology build on Darwinian ideas to reveal new insights into the evolution of mammals.