National Geographic
National Geographic: Stunning Footage: Epic Animal Migrations in Yellowstone
Some of the world's most incredible animal migrations take place in the Greater Yellowstone Ecosystem. Among them are a 120-mile pronghorn migration and nine elk herds with unique migration patterns. While on assignment in Yellowstone,...
Annenberg Foundation
Annenberg Learner: Teacher Resources: Journey North
Four video-segments highlight the study of seasonal change through the "Journey North" website: "Introduction," "Seasonal Migration," "Plants and Seasons," and "Sunlight and Seasons."