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[Ryan Martis]

Monarch Butterflies, Mexico


Millions of monarch butterflies travel to ancestral winter roosts in Mexico’s shrinking mountain fir forests. Photograph by Joel Sartore, National Geographic photographer.

[Ryan Martis]

Zebras, Botswana


In Botswana, one of the largest zebra migrations on the continent takes place each year, as some 25,000 zebra follow the rains and cross from the Okavango Delta. Photograph by Robert B. Haas, National Geographic photographer.

[Ryan Martis]

White Pelicans, Mississippi


White pelicans are among the largest Mississippi Flyway migrants. They use a unique fishing technique, cooperatively herding fish into small areas on the surface where the pickings are easy. Photograph by Annie Griffiths, National
Geographic photographer.

[Ryan Martis]

Pacific Salmon


Six Pacific salmon species migrate back to Russia’s remote Kamchatka Peninsula to spawn, their shapes and colors changing dramatically as they move into fresh water. Photographed by Randy Olson

[Ryan Martis]

Pronghorn, Wyoming


Wyoming’s Grand Teton National Park. Photographed by Joe Riis

[Ryan Martis]

Snow Geese, New Mexico


Snow geese in New Mexico’s Bosque del Apache National Wildlife Refuge flock along the Rio Grande. Photographed by Ralph Lee Hopkins

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