Here%27s one glimpse at the big picture%3A a map of elk migrations in Greater Yellowstone created by the Wyoming Migration Initiative. Every mammal and bird species in Greater Yellowstone disperses in some way or another%2C The diversity and distance of migrations in Greater Yellowstone%2C considered a marvel in the world%2C is unparalleled in the Lower 48. It only persists because landscapes remain relatively intact but that is fast changing. Graphic courtesy Wyoming Migration Initiative.