Two become one: two raven lineages merge in 'speciation reversal'

After up to two million years of separate evolution, two types of common raven have been ‘caught in the act’ of consolidation, say scientistsSpeciation, where one species diverges into two, is a well-known concept in the theory of evolution. But a new study based on almost 20 years of research has revealed that “speciation reversal”, the merging of two previously distinct lineages, may also play an important role.Scientists have discovered that two lineages of common rave