World's Great Animal Migrations
Ordinary looking except for the distinctive black stripes that give them their name, bar-headed geese actually have the avian equivalent of superpowers: they are the world's highest-altitude migrating species. Flocks make staggering flights above the 20,000-foot-plus peaks of the Himalayas from their winter feeding grounds in India to their summer nesting grounds in Tibet. They have even allegedly been spotted over Everest. While it's nearly impossible to catch these migrations in action (they typically happen in a single day, and weather conditions can make visibility very poor), the remarkable geese are easily seen in winter along central India's Chambal River.
When to Go: February.
How to Get There: Birdquest's 12-day Tigers & Birds of Bandhavgarh tour brings small groups into the National Chambal Sanctuary, as well as to Bandhavgarh National Park in Madhya Pradesh where tigers roam (from $4,130 per person).