Monarchs and Milkweed: A Migrating Butterfly, a Poisonous Plant, and Their Remarkable Story of Coevolution

Front Cover
Princeton University Press, Mar 7, 2017 - Science - 296 pages

The fascinating and complex evolutionary relationship of the monarch butterfly and the milkweed plant

Monarch butterflies are one of nature's most recognizable creatures, known for their bright colors and epic annual migration from the United States and Canada to Mexico. Yet there is much more to the monarch than its distinctive presence and mythic journeying. In Monarchs and Milkweed, Anurag Agrawal presents a vivid investigation into how the monarch butterfly has evolved closely alongside the milkweed—a toxic plant named for the sticky white substance emitted when its leaves are damaged—and how this inextricable and intimate relationship has been like an arms race over the millennia, a battle of exploitation and defense between two fascinating species.

The monarch life cycle begins each spring when it deposits eggs on milkweed leaves. But this dependency of monarchs on milkweeds as food is not reciprocated, and milkweeds do all they can to poison or thwart the young monarchs. Agrawal delves into major scientific discoveries, including his own pioneering research, and traces how plant poisons have not only shaped monarch-milkweed interactions but have also been culturally important for centuries. Agrawal presents current ideas regarding the recent decline in monarch populations, including habitat destruction, increased winter storms, and lack of milkweed—the last one a theory that the author rejects. He evaluates the current sustainability of monarchs and reveals a novel explanation for their plummeting numbers.

Lavishly illustrated with more than eighty color photos and images, Monarchs and Milkweed takes readers on an unforgettable exploration of one of nature's most important and sophisticated evolutionary relationships.


What people are saying - Write a review

LibraryThing Review

User Review  - bemislibrary - LibraryThing

A white, yellow, and black-striped caterpillar is transformed into a beautiful black, orange, and multi-colored butterfly. The author traces the migration and transformation from a caterpillar eating ... Read full review

LibraryThing Review

User Review  - DavidWineberg - LibraryThing

I suppose you know this means War The Hundred Years War has nothing on the Monarchs and the Milkweed. They’ve been going at it for 350 million years now. Unlike the heart-warming mutualistic ... Read full review


CHAPTER 1 Welcome to the Monarchy
CHAPTER 2 The Arms Race
CHAPTER 3 The Chemistry of Medicine and Poison
CHAPTER 4 Waiting Mating and Migrating
CHAPTER 5 Hatching and Defending
CHAPTER 6 Saving Up to Raise a Family
CHAPTER 7 The Milkweed Village
CHAPTER 8 The Autumn Migration
CHAPTER 9 Long Live the Monarchy
Image Credits

Other editions - View all

Common terms and phrases

About the author (2017)

Anurag Agrawal is a professor in the Department of Ecology and Evolutionary Biology and the Department of Entomology at Cornell University. He lives in Ithaca, New York.

Bibliographic information