Navigating the Whys and Wonders of Animal Migration across the Globe
Mammals - Land and Sea Voyagers

Mammals, too, undertake impressive migrations. Caribou in North America trek hundreds of miles in search of fresh grazing grounds, while African wildebeest undertake an annual circuit of the Serengeti in search of food and water. In the oceans, whales travel thousands of miles to reach breeding grounds, navigating with precision through vast and featureless waters.