Speciation is often considered unidirectional: a continual process of divergence interrupted only by extinction events. However, this isn’t entirely true. In this episode Dr Jente Ottenburghs (Wageningen University) discusses the curious case of the bean geese: where speciation appears to have stopped and, perhaps, begun to reverse.

Associated article: Recent introgression between Taiga Bean Goose and Tundra Bean Goose results in a largely homogeneous landscape of genetic differentiation

https://www.nature.com/articles/s41437-020-0322-z