It's one of nature's most spectacular phenomena: Watching animals migrate en masse.
Travel to the Mexican highlands to witness one of the world's most intriguing natural phenomena.
Multiple departures, January-March
Swim alongside gentle whale sharks, the world’s biggest fish.
Multiple departures, July & August
World Wildlife Fund
1250 24th Street, N.W.
Washington, DC 20037
© 2016 World Wildlife Fund
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