One might assume that birds of flight are cosmopolitan travelers, and bird species should be distributed far and wide, spread across long distances—continents even. However, a study led by Alex White, Ph.D., a former University of Chicago graduate student now at National Museum of Natural History in Washington, D.C, shows that a bird has strong ties to the climate patterns of its habitat. As a result, the geographical distribution of birds may be more restricted than we think.
Click here for original story, Birds of a feather flock together, but only in similar climates
Source: Phys.org