This story appears in the November 2010 issue of National Geographic magazine. Animal migration is a phenomenon far grander and more patterned than animal movement. It represents collective travel ...

The iconic North American butterfly's annual migration patterns are under threat from habitat loss and extreme weather, causing its devoted fans to research solutions and push for protection from the ...

Arrows denote ports and the adjacent numbers are their steady migration rates, in individuals per generation. If given, the date in parentheses indicates when the port opens. Upon opening, there is ...