The Himalayan forest thrush (Zoothera salimalii – photo by Craig Brelsford above) is a newly described species of bird. It was formerly grouped with Z. mollissima, which breeds above the tree line. In contrast, Z. salimalii breeds in coniferous forests up to the tree line, from Tibet to Vietnam. In addition, Z. salimalii has a different song from its alpine cousin, as well as differing genetically. This is enough to make it a distinct species.
With improvements in technologies for DNA and other analyses, we are starting to see many such new species “carved out” of existing ones.