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Jaret Daniels / University of Florida via AP file ORLANDO, Florida - After six years of searching, an entomologist has concluded that three varieties of butterflies native to south Florida have become extinct, nearly doubling the number of North American butterflies known to be gone. "These are unique butterflies to Florida.

National Geographic Channel's groundbreaking series Great Migrations explores the massive movement of animal populations around the planet. The project chronicles these inspirational, often harrowing journeys that are marked by unforgiving odds, and what it means to move like your life depends on it. Wildebeests, zebras, red crabs, Mali elephants, walruses, monarch butterflies, jellyfish, and whale sharks will all be on display, and the production crew traveled some 420,000 miles, filming hundreds of stories in more than 20 countries. Using new science and technology, the series reveals how animals make death-defying journeys to survive. Great Migrations is the largest undertaking of its kind in the National Geographic Society's 120-year history. The seven-hour miniseries premieres globally in fall 2010. National Geographic's net proceeds support vital exploration, conservation, research, and education.

Butterflies and Moths of North America is an ambitious effort to collect, store, and share species information and occurrence data. Access species profiles, interactive distribution maps, and photographs by browsing checklists or taxonomy pages, or by searching for a species of interest.

A new census found this winter's population of North American monarch butterflies in Mexico was at the lowest level ever measured. Insect ecologist Orley Taylor talks to Yale Environment 360 about how the planting of genetically modified crops and the resulting use of herbicides has contributed to the monarchs' decline.