For thousands of years, millions of monarch butterflies have migrated from the northern U.S. and Canada to Mexico for the winter. But exactly how they know where to go is still a mystery.

Did you know that caterpillars come from butterfly eggs? See pictures of butterflies laying eggs on their host plants.

Monarchs traveled to a remote part of Mexico, a journey they've made for thousands of years, and wintered there. Now tens of millions of the butterflies are on an epic aerial journey back north.

By creating a garden that supports caterpillars, you’re nurturing the next generation of butterflies and moths and ...

Monarch butterflies are migrating through San Antonio, laying eggs on milkweed, while other species like the Gulf fritillary ...

At the Atlanta Science Festival in March, Dr. Jaap de Roode discussed his book, "Doctors by Nature: How Ants, Apes & Other ...

Monarchs lay their eggs on milkweed plants and the young caterpillars feed exclusively on them. Butterfly conservationists encourage people to plant them where they can to promote monarch populations.