World's Great Animal Migrations
Alaska Stock / Alamy
Caribou Migration, Alaska
The Arctic National Wildlife Refuge—particularly the northeastern corner of Alaska where the Kongakut River cleaves the Eastern Brooks Range—is an annual destination for masses of traveling caribou. About 115,000 animals gather here each summer to give birth to and raise their calves before heading south for the winter; during the summer months, the 24-hour sunlight illuminates the lowing, fuzzy-antlered herds, the wolves and grizzlies that follow them, and the ruggedly beautiful mountain peaks covered with new-blooming wildflowers.
When to Go: June and July.
How to Go: Arctic Wild runs seven-day backpacking-and-camping treks for small groups along a 35-mile stretch of the Kongakut River valley. Travelers typically find themselves hiking right alongside clusters of caribou with their new calves ($3,500 per person).