Mammalian evolution is the study of how mammals have evolved and diversified over time. This field of research examines the origins of mammals, their relationships to other animals, their adaptations to various environments, and the factors that have influenced their evolution. Researchers in this area use a combination of fossil evidence, comparative anatomy, genetics, and other methods to understand the evolutionary history of mammals and how they have adapted to different ecological niches. Studies in mammalian evolution can provide insights into the processes of evolution and help us better understand the diversity and complexity of mammalian life on Earth.