Brown Creeper

While the Brown Creeper bears an extremely close physical resemblance to the Old world cousins, Eurasian Treecreeper or Short-toed Treecreeper, it is a separate species. At one time, the Brown Creeper considered the same species as the Eurasian Treecreeper. In studies, including experiments having the Eurasian and Brown sing to each other, it was found that they do not respond to each other's songs, thus supporting the theory of them being separate species.  

While the Brown Creeper bears an extremely close physical resemblance to the Old world cousins, Eurasian Treecreeper or Short-toed Treecreeper, it is a separate species. At one time, the Brown Creeper considered the same species as the Eurasian Treecreeper. In studies, including experiments having the Eurasian and Brown sing to each other, it was found that they do not respond to each other's songs, thus supporting the theory of them being separate species.