Explore the fascinating process of speciation in this 51-minute lecture from Yale University's "Principles of Evolution, Ecology and Behavior" course. Delve into the various definitions of species, focusing on reproductive isolation and phylogenetic similarities. Examine how geographical separation and ecological specialization contribute to the formation of new species. Learn about the stages of speciation, from distinct populations to fully diverged species. Discover the genetics behind speciation, explore real-world examples, and understand experiments and applications in the field. Gain insights into cryptic species and their significance in evolutionary biology. This comprehensive lecture covers everything from basic concepts to advanced topics in speciation, providing a solid foundation for understanding this crucial aspect of evolutionary biology.