World's Great Animal Migrations

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Mira / Alamy

Humans aren't the only ones on the move. Be awed by great animal migrations of every size, from butterflies to elephants.

Monarch Butterfly Migration, Mexico

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Every winter, more than 300 million vivid tiger-striped butterflies flock to the mountainous regions of Anguangeo and Valle de Bravo, in Michoacán, to escape the winter cold further north. Some areas, which have been designated as national butterfly sanctuaries, attract such a dense population of monarchs that the oyamel branches where they congregate in great, moving clusters have been known to collapse beneath them.

When to Go: January and February.

How to Go: Natural Habitat Adventures leads six-day, small-group treks that visit several butterfly sanctuaries, both on foot and horseback (from $2,995 per person).

World's Great Animal Migrations

Monarch Butterfly Migration, Mexico

Every winter, more than 300 million vivid tiger-striped butterflies flock to the mountainous regions of Anguangeo and Valle de Bravo, in Michoacán, to escape the winter cold further north. Some areas, which have been designated as national butterfly sanctuaries, attract such a dense population of monarchs that the oyamel branches where they congregate in great, moving clusters have been known to collapse beneath them.

When to Go: January and February.

How to Go: Natural Habitat Adventures leads six-day, small-group treks that visit several butterfly sanctuaries, both on foot and horseback (from $2,995 per person).

Mira / Alamy
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