Every year, the Monarch Butterfly, Danaus Plexippus, goes from the USA to Mexico in a massive migration of about 5,000 kilometers. Millions of this butterfly start it with the unique help of their instinct. Sara Dykman accompanied them by pedaling for nine months in which she learned a lot about this insect and came across interesting people. As a result, she wrote the book Bicycling with Butterflies which is plenty of data and rigor as well as humor and lyricism.

In reality, the Monarch Butterfly spends Winter in the Oyamel forests in Michoacan, Mexico and flies to the USA and Canada. When the cold of Autumn arrives, they go back to Mexico. Four generations are needed to complete the migration and lay their eggs on the milkweed plant. Thus, the butterflies which return to Mexico are the great-granddaughter of the ones which initiated the migration.

Sara studied the specie and discovered that this butterfly travels about one hundred kilometers a day. This figure is the preferred one to ride in a day for Sara. She learned a lot about people and butterflies since she claims that we are connected to nature and the force of unity: A butterfly weights 0.5 grams, but if millions perch on a branch, they can break it.