For the more information about the geologic resources of the National Park Service, please visit

Ecological Roles of Migratory Species

Migratory species may have strong ecological influences and fulfill important ecological roles, including:

Eagle Bison and Elk Elk
Predators Grazers Prey
Monarch Butterfly Band Tail Pigeon  
Pollinators Seed Dispersers  

Last Updated: December 17, 2010