The monarch butterfly is our best-known and best-loved insect, and its annual migration over thousands of miles is an extraordinary natural phenomenon. Robert M

Although no one had ever followed North American monarch butterflies on their annual southward journey to Mexico and California, in the 1990s there were well-ac

“What a wonderful idea for an adventure! Absolutely inspired, timely, and important.” —Alistair Humphreys, National Geographic Adventurer of the Year and

Synthesizes current scientific knowledge on the life cycle, behavior, spectacular migration, and conservation of this charismatic insect.

With his lifelong fascination with butterflies, America's best-known lepidopterist set himself an irresistible challenge: how many of the 800 species of butterf